If Wagner takes Moscow, it's game over for Putler, His only option would be to split the country with him as the leader of the break away region.

Now, the million dollar question, what happens with the nukes? The long range balistic missiles would probably fall into Prigozhin's hands, but what happens with the ones in Belarus? Which side will Lukashenko support? Will he let Putin use this tactical weapons against Wagner troops or hand them over to Prigozhin?

So many unknowns right now.

Putin has to say that Wagner isn't that much of a threat to keep people calm and following his orders.

I would imagine that Prigozhin would do the same thing that any other person attempting a coup would do, seize control of government buildings and other important facilities and attempt to convince the public that he is in charge.

The best answer anyone can give to those questions are "I don't know". Anything else is a guess.

My guess is, if Wagner takes Moscow and Putin's not there, Putin is done. Gorbachev wasn't in Moscow when the last coup happened. But once a leader has lost control to this degree, it's hard for anyone to respect them as a leader again.