OOC: I'm sorry if I come across the no fun allowed man of this forum for certain areas of history when it comes to plausibility, I don't see a boyar period or a break of Russia ever happening. First, the Boyars to my knowledge ceased to be a major influential power after Ivan the Terrible killed those boyars who he did not trust while keeping the Oprichnina system as an administration loyal to him. Second Russia wouldn't split back into principalities as it basically united under one, that being Muscovy, and the Rurikid male line by that time was extinct so it's not like there be any recent precedent for separatism. There's also the fact that if Russia did separate they be vulnerable to invasions westward if either the PLC or Sweden decided to invade, the Time of Troubles which exactly that was pretty brutal that I don't regardless of grievances with the Tsar no one is going to secede over this.
Personally, I'm glad he was overthrown, taking away beards and "westernizing" what a load of assimilationist bupkiss.