Nope, absolutely not. At least in my mind it's a hard no.
As to some of your other questions...
I think there is nothing anyone can do outside of Russia... so it's a moot point anyways.
But inside Russia is where it gets tricky... I don't necessarily believe Putin will lose his head over what he has done so far... But the oligarchs aren't stupid either. They are in a permanently damaged financial situation (for however many years "permanent" actually means) and, even though they no longer are in "Putin's inner circle", I can't imagine they have zero contacts both within the inner circle and with Putin himself. Any serious griping from the oligarchs or the inner circle will have some kind of impact on Putin's leadership, including and up to "you need to step down."
What actual chances of that happening are... unknown. But it's not zero either, and it may, or may not include, violence.
The other thing is: I don't think the Russians are stopping anything at this point. After the rainy season, in another month or so, the ground will dry up and Russian tanks can roll again. There may be another secondary invasion beginning mid-May or so. ONLY if Ukraine survives that and damages Russian invading forces will the "inner circle" talking get loud enough for there to be any chance of regime change in Russia.
And I won't bet on a violent change either. Russia may back off (if Ukraine survives a second assault), ask Putin to retire to his billionaires mansion in southern Russia, and simply hide/ protect him while emplacing a less belligerent leader.
But... I'm certain Putin will have something to say about that scenario.
Currently, the world is stuck with a belligerent, fascist, murderous dictator at the head of a nuclear state... with no real way out of that aside from what Russian Insiders may, or may not be able to do.
In whatever direction Russia turns over the next several months... Everyone on the planet seriously hopes that Putin isn't so reckless/ dangerous/ belligerent that he actually decides to start pushing buttons.