My oppinion
Brief TL
- 106-150: dacian people split in two parts: daco-romans(dacians + roman colonists), and V-dacians(conservative dacians, V from vlach, refering to life-style, not linguistic). First category live in cities and lowlands, the last was forced to adopt highland herdery life-style, latter encountered to vlachs)
- 150-250: daco-roman population increase, but V-dacian population not neccessarely decrease, because of migration of free dacians, tempted by specific products commerce with daco-romans. V-dacians become, somehow, trouble for romans. Even many becomed daco-romans, Carpathian mountains become a kind of over-inflated baloon, because of the over-population. After few revolts, finally V-dacians(part of them) were granted to settle in South-danube highlands, remained low-populated because of intense urbanisation. Here they encountered thraco-illirian highlanders, but V-dacians outnumber them, and asimilate them.
- 250-300: goths invade in waves. daco-romans retreat south-Danube, but a significant part take refuge in V-dacians terittory. V-dacians asimilate them, and this is the first step of the latinisation of the language. V-dacians live pretty undisturbed by goths at north-Danube, but the over-population re-appear. So, part of them migrate south-Danube either, increasing the population and occupied teritorry of V-dacians here. The daco-romans live only south-danube, were they form new provinces called Dacia where are majoritars. Here they asimilate the thraco-iliro remaints. Daco-romans play a significant role in the Empire, giving personalities as Galerius, Licinius, Daia, Regalianus.
- 300-350: in north Danube, goths are replaced by gepids, but V-dacians remain pretty undisturbed, in their not-desired highlands. Some of them migrate to low-lands and mix with gepids, and gothic remaints. Constantine grant them as roman citizens, and try to re-establish a bridge-head at north-Danube, but this will not last long, so, they were re-absorbed in V-dacians population at north-danube. In south-Danube, daco-romans begin to be asimilated by the thraco-illiro latin speakers populations. V-dacians population here increase in tinny steps, due to daco-romans migartions in their teritorry.
- 350-600: dark-age of north-balkans begins. The inter-mixtures become intense, and pretty randomlly. Daco-romans dissapear pretty fast, absorbed by Thraco-illirian latin speakers, and by V-dacians. In few decades after, a new proccess begin: the latin-speakers themselves, step by step, begin to be absorbed by gepid, slav, avar invaders. The refugee ones are asimilated by V-dacians. In the teritories of the V-dacians at south-Danube, begin to appear the over-population problem. Part of them split from V-dacians, and form albanian nation. Part of them migrate north-danube, increasing the number of V-dacians there, and mentaining the ethno-linguistic homogenity between south and north Danube V-dacians. Here, in north-Danube, was a relative long period of gepid rule stability. But finally gepids from low-lands are relegated by avars, and part of them are absorbed by V-dacians. Over-population re-appear, and part of them join to south-Danube V-dacians. Arround 600, V-dacians language is a pretty latinised one.
- 600-700: Latin speakers dissapear, because of slavs and bulgarians relegation&asimilation. The relegated ones are asimilated by south-Danube V-dacians, and Vlachs nation appear. The life-style is completely V-dacian, but latin speakers succed to cvasi-latinise the language and to impose the name of the new nation(rumân, român). Over-population appear, and part of them migrate in north Danube V-dacians teritorry. Not long, at north Danube, avars share the faith of gepids in front of slavo-bulgar invasion. Part of them are asimilated by Vlachs-over population appear, along with part migration in south Danube Vlach teritory. The north Danube Vlachs concentrate especially in Transylvanian highlands and demi-lowlands. Part of them settle in south Panonia.
- 700-1000: The south Danube highlands become to be claimed by the increasing slavo-bulgarian populations. A huge portion of south-Danube Vlachs was forced to migrate in Moesia and north-Danube. At north-danube, highlands were full inhabited already by Vlachs, so the south-danube Vlachs migrants, step by step, relegate&asimilate the slavic, cuman and pecheneg populations from lowlands. In middle and south balkans, only isolated islands of Vlachs remained, who begin to corrupe the name rumân, român, in arumân, armân.
-1000-1200: Finally, all the vlachs from Moesia migrate north-danube, relagating&asimilating the slavs, bulgarians, cumans and pechenegs remaints. Only in bulgarian and Serbian Timoc, a majority vlach(românească) population remained.