You make a slew of great points, as always. Unfortunately, on the other side we have the all but unquantifiable treachery of the Sessions-Rosenstein bff tag team. What that pair did to Trump defies description. By giving Mueller an open-ended mandate, unlimited resources and blind DOJ support they virtually guaranteed the investigation will be indefinite.
BUT the instant Trump makes any move against Sessions or Mueller the Watergate hysteria will start and never end. By painting Trump as Nixon Saturday Night Massacring his ‘enemies,’ they will literally hound him out of office. The GOP will join in; most of them hate Trump as much or more than the Democrats. The idea that Trump could survive total isolation and brutal, never-ending attacks is a fairytale. They would take him down the way a huge pack of hyenas takes down a lone prey. He wouldn’t stand a chance.
People are desperate to blame Trump, but this is a Sessions creation. He did it so quickly and secretively that the coup was complete before Trump could intervene. It was treachery, pure and simple. Sorry, Sessions-defenders; he’s the guilty party.
That media/frenemy onslaught is going happen either way. But if he pre-emptively strikes, that is the only major battle front he will be fighting, and he has the goods on why they should be fired, which Nixon didn't. But if he waits, he will have that same battlefront, plus the battlefront of whatever BS that Mueller tries to trot out, most likely being completely trumped up charges on illegally obtained evidence. So he would have twice the fight on his hands.
This is of course assuming that Trump and Mueller haven't agreed on some eventual cease fire, so they can both leave with their dignity intact, which can't be completely discounted. But if they are truly at war, and war is hell, the sooner he can get it over and move on to the MAGA agenda, which by the way includes firing deep state agents such a Mueller anyway, the better.