Great question. If the Whites win, Russia becomes weak democracy. But at some point, a strong man takes over. It's just happened so many times in the past (and now) that it is the standard script.
As to going to war with them, anybody's guess is a good one. On one side, the Germans invaded Poland and Russia saw herself as the protector of the Slavs. On the other side, even that title didn't stop the Soviets from taking half of Poland.
The Romanovs are dead ducks. Died during the Civil War. No way they come out of it anyway but feet first.