What makes you think that?

Would Putin really allow that to happen? If he could not stop it, what do you think he would do?
I mean, he would officially be president, representing that party, right?

Is this a common opinion?
+1
How did they fail?
France had 7 years for 1 presidental term, no?
5 years.
That depends on whether he would want to stay for the second (fourth ) term.
It doesn't. He can take another post, prime-ministre for example.