yboxman
Banned
Parts of Moldova were relatively sparsely populated in the 19th century (it suffered from wars into the early 19th century, but was very fertile, well-watered and well-insolated, and so had very high carrying capacity), which left room for some immigration. However, the Western Country was very much overpopulated even in the 19th century, and even with technology of the time. It means that realistic levels of outmigration of Jews and Catholics from Lithuania, Belarus and Right-Bank Ukraine would be unlikely to lead to a labor deficit there, so massive Russian Orthodox immigration to these lands would be unlikely as well.
I'm thinking more in terms of Urbanization, and the immigration of labor to the new industrial enterprises, rather than in terms of rural settlement. The "natural" tendency of such immigration is to come from the immediate hinterland of the cities. This process is still in it's infancy in the 1890s- if the "surplus" population of the hinterland in the Western Borderlands ios drained then either industrial development lags or labor comes from farther afield- specifically the Ethnic Russian interior. That's the social engineering mechanism Stalin and Khrushechev used, though they also had massive state intervention in building new idustries and recruiting workers for them. Witte might do something similliar, but on a more modest scale. Consider that Tsarist Kiev was Ehnically-linguistically mostly Russian in 1897 just as Germans dominated Prague and Budapest well into the 19th century. The trends eliminating this dominance cannot be eliminated of course- but they can be ameliorated through state intervention.
That said, a state intervention on land reclamation in the Pripet marshes is not impossible. If this occurs, Conscript settlers from the Great Russian heartland can be expected to do most of the work and the Settling.
The Soviet policy of settling Russians and kindred peoples in the Baltics worked only because they built a lot of factories and housing there, thus providing relatively well-paid jobs and decent accommodation for these immigrants (the Holocaust and forced outmigration of the native peoples in the 1940s also helped, but there still would be no labor deficit in the Baltics after the 1950s if not for Soviet industrial investment). I do not think that the Tsarist Russia was able (or willing, or needed) to build many factories in the Western Country.
It wasn't willing OTL. It needed to, for strategic purposes (Ie; supplying the troops in case of war with the Germanic powers), but chose instead to favor industrial development in the Russian heartland due to inertia and pressure by the Traditional industrial magnates of Moscow and ST.Petersburg (many of them, incidentially Old bleievers).
I can't see Witte being as interventionist as Stalin but some modest subsidies to industrialists relocating to Talinn and recruiting the "right" people (maybe even drafted economic soldiers) is possible.
Of course, emigrating Jews and Catholic peasants would leave their houses and farms behind, but Russian peasants were, as Witte correctly noticed in your TL, strongly "attached to the villages of their birth."
I'm thinking more in terms of "surplus sons" not staying back at their parent's farms and fighting for the inheritance with their older brothers or immigrating to the local cities to form an urban protelatariast.
Though there are not many Jewish Peasants, or Polish peasants for that matter East of the Bug. The former are town/Shtetl dwellers and the latter often landlords with Orthodox and Uniate Slav peasants working their lands. The "Younger son scenario" applies more to the Moldavans, Uniate and overly "Polonized" Ukrainians and White Russians, non German Balts, Georgians and Armenians.