The only successor to President Putin is President Putin himself and we could of course dream about President Putin stepping down voluntarily and picking out successor which would be probably as bad as him.
There are many facts showing that Putin's people enriched themselves by using power mechanisms so that's why for them losing power means losing their fortunes.
Ukraine had quite serious impact on the many Russians. They could see that ordinary people in Ukraine which is a bordering state, very close to Russia, the people of this state are, they didn't want to tolerate anymore the power abuse by Ukrainian officials.