It could not happen. There are many reasons for this, let me explain it to you:
1) Now the Romanian people always said that they are of Roman descend and therefore that they are latin people. So, all latin people write with the latin alphabet.
Didn't stop the Cyrillic alphabet being used in Moldova (though admittedly, because of the influence of Russian, there are some areas where there could have been precision needed - say, restoring the old Romanian letter <џ>, as in the old Romanian Cyrillic alphabet - or heck, as the Moldavian dialects are conservative in retaining /dz/ where Romanian elsewhere uses /z/, why not resurrect the Macedonian-style dzelo <ѕ> for /dz/?), even if it was forced.
2) The Romanian people from the 10 century where under firt Hungarian and then Ottoman control and neither used cirilic. Its tru that at first Romania used cirilic alphabet to write but even the they used it for little time and just a few people. It was easy to change alphabet.
Actually, no it wasn't easy - Cyrillic was the alphabet of what was then
the presitigious language of the area at the time of Romania's conversion to Orthodox Christianity, which just happened to be Church Slavonic. Granted, the original Cyrillic alphabet could have been reformed to make it simpler to use, but even with that Romania's switch to Latin was largely politically motivated.
3) Even during communist rule in Romania the leadership wanted to be asociated with western Europe, more precisely the French so they heavily pushed the cultural and linguistic kinship theory.(during the 1947-1989 period there where more french teachers then russian for exemple).
Well, find a reason for the Romanian leadership to think otherwise, and bam! - there's your POD for Romania to revert back to Cyrillic.
5) A Roman alphabet showed the world that they are different then their slavic neighbors.
Umm, that much I can dispute as a lot of the Slavic languages (mainly the Western Slavic languages and the Western South Slavic languages) already have Latin orthographies in use, so that wouldn't make Romanian unique in that sense.