Realistically, no one worth their salt could replace Putin and expect that person to hold Russia together. Putin made sure no one could upstage him.
The best case scenario for Russia post-Putin is to have a Maduro-type leader. Someone competent enough to hold on to power and enrich his cronies boyars, although could never have the charisma to gain enough popular support and cult following of his predecessor. Thus, the next leader is in a precarious hold on the power like Maduro.
Realistically, no one worth their salt could replace Putin and expect that person to hold Russia together. Putin made sure no one could upstage him.
The best case scenario for Russia post-Putin is to have a Maduro-type leader. Someone competent enough to hold on to power and enrich his cronies
boyars, although could never have the charisma to gain enough popular support and cult following of his predecessor. Thus, the next leader is in a precarious hold on the power like Maduro.