If this happens it will prove everyone right who said the West needed to forcefully push Russia out from Ukraine in the beginning, boots on the ground and everything.

My 2-cents is most people assume Putin controls every dial and lever. I don't believe he does. If there's a Russian Nationalist faction holding that NZPP and they feel like blowing it up they will. As in WWII, I still believe the West is sleepwalking into a wider war as you suggest might happen.