But based on what especially
@harms and
@Demyanenko_square_jaw are saying here, I wouldn't be too optimistic about what that change could bring.
A new leader would probably try to back out of Ukraine ASAP given how the invasion is going for Russia, and that would be good, obviously. But otherwise, new leaders most likely would come from the current circles of the mighty and hence probably wouldn't be very different from Putin in their attitudes to democracy/autocracy. And given how the Russian people have been brainwashed, and will now be suffering due to the sanctions, the new leaders likely won't be any less nationalistic and anti-western either.
So that would be change, but not really for the better; more of the same, rather. And I think current western actions don't intend any different. The long-term plan isn't to improve things for Russians, but to seize on the current situation to crush Russia out of global significance, whatever the cost for the Russian people.
Not that I would know how things could be done differently, especially without a huge cost in turn for Ukrainians; but none of it leads to much optimism for me. As always, the High & Mighty make their moves (including the dead-end Russian propaganda that has brainwashed its population into supporting suicidal policies and actions), and the common people suffer.