This is fast becoming one of those 'be careful what you wish for' situations. Any sane person had to want Russia to fail to take Ukraine, but who believed in that possibility seriously enough to imagine how dangerous it has become to have Putin facing the increasing likelihood of his own extinction. While the possible mechanisms may remain opaque to us, I have no doubt Putin can not outlive an outright defeat of the Russian military in Ukraine.
After the early Russian set-backs the talk was all of 'off-ramps', but Putin's brutality against the Ukrainian population keeps closing off possibilities day by day. Putin is basically now Bashar Assad, but without hope of any one to play Russia to his Syria