If Russia adopts martial law, it will instantly contradict all of propoganda and all of their work keeping Russians in the dark will go out the window in an instant. Though no doubt when services stopped working and the ruble crashed people must have already started to figure things out.
If Ukraine can destroy that large convoy(or did already), then I think it basically means Putin cannot invade Ukraine with a land war. I do not think he will stop. So he will instead resort to his last resort, and that is literally leveling everything with massive bombs. Every FOAB he has will be dropped there in city centers and what not. If this man hates his own citizens so much for being against him, imagine how much he hates Ukranian citizens for standing up to and stopping his army in many towns etc. If that convoy got decimated way before it even got to its target, I dont see how Russia physically takes any of the major centers in Ukraine without just obliterating everything. The longer it goes on, the more soldiers desert, the more supplies get burned through, the more money he loses, the more he realizes time is running out to invade Ukraine the more desperate and unhinged he will become. Again, I think its going to take a major uprising of the Russian people or a coup to end it without massive loss of life(far beyond what we have seen so far). Im hopeful that will happen, and the end result will ultimately be the opportunity for the Russian people to be free, if they finally take it. They've had multiple opportunities in the past 100 years to do what most nations with democracies had to do: go through brutal times and give up some of their lives for the sake of freedom. They didnt take those opportunities. Now they get another chance.