Yes, we do need to have some idea of what the Aftermath would look like and it can't be back to business as usual. That's unrealistic and ignores that many people wanted to see change.
Otoh, if Mueller brings down only Trump and his family, Pence and his Koch brother friends will slot into their new roles and continue with the same agenda. Trump will be discarded as an aberration, best forgotten and look what we all said about him in 2016.
If Mueller brings down the government - senior GOP and Trump's WH team, the right wing will see it as a liberal coup. That is what they are being prepared for by the NRA, Fox, the right wing press and Trump's tweets. As Pain says this means there will always be a large noisy chunk of supporters who believe in Trump and his agenda.
You could say wait til 2018 but will the midterms be honest? We already know they are working on voter suppression tactics, and no-one in GOP seems keen to stop Russian support interference. It will be worse in 2020.