Of course, Putin have control over all media, police, secret service and, in the short period, there is no chance to change everything.
Putin will win next presidential election, it's obvious.
In Russia, historically, every real changes in society could come through revolution only.
Last revolution they had 100 years ago with Lenin.
No way that Putin will give up from power in peaceful way.
But, he can't sleep peacefully any more
The Russians will not revolt against Putin, the only way that even revolution can take place is after the death of President Putin. And it may shock some people that after Putin is gone will we see some people who are far worse than Putin himself.
I don't know who will succeed Putin in Russia. Right now, there are no good candidates. United Russia leaders such as Dmitry Medvedev and Sergey Lavrov are not very popular. Ramzan Kadyrov and Sergey Shoygu may not be able to take the post due to their ethnic origin. Among the opposition activists, the only viable candidate (Alexey Navalny) is hated by the majority of the population.
Indeed, there is no one to replace Putin yet, and there is no guarantee that the new ruler will be better. Kadyrov is a good person in my opinion, but unfortunately he can not take this place. So Russia will have to live with Putin