Wagner Group captures headquarters of the Southern Military District and the building of the Ministry of Internal Affairs in Rostov, the headquarters of Russia's base of operations for War in Ukraine
They already control a city with one million inhabitants, with one of the five military headquarters of the Russian military. I wouldn't call this a "small rebellion" yet.
They're a 50000-person-strong PMC. No way can they take on the full might of the Russian military unless you see huge swathes of the military join their rebellion.
in the movie Crimson Tide, the issue was the radical (cant remember his name) was sweeping to power as he won the 'hearts and minds' of the russian miliary. Now thats fiction set in post cold war russia, but I can definitely see the similarities. I wouldnt be surprised if Wagner are joined by brigades sent to 'stop' them