I'm interested to know why you think it would be a disaster? You can move Diaz to LW in place of Harvey and have Jota and Salah upfront. The formation puts numbers in MF and protects our right from being over loaded
Because it's too flat and the players are used to playing in a fluid formation. So not only are you putting players in fixed positions, assuming they will stay there, you're adding a new less rigid, tactical mindset to a group of players who've previously had all the freedom in the world to express themselves.
Trent is a poor defender. I don't think Klopp has helped in hanging him out to dry in a system that's set up to get the best out of him, but with players who are waning around him and in a role that's become more and more advanced and unsustainable. Klopp has pushed and pushed his position forward, expecting the attacking outcome to diminish the defensive shortfall, when the exact opposite has happened. His attacking prowess and confidence has been dented and we're even more vulnerable than we already were.
I don't know what the answer is, though I suspect the obvious is either to play a different right back and find a new role for Trent, or try to compress the defensive line and system a bit more, so it's more watertight. The truth is probably in there somewhere, but the problem (or admirable persistence) with Klopp is that he will stick with it until it works again, either by players finding form again (a tough ask for those who are ageing) or by eventually replacing players to enable Trent to reach those levels again.
It's a matter of patience, it's frustrating, infuriating even and we will suffer for a season for it for the greater good, in Klopp's eyes. The issue though, I feel, is symptomatic of Klopp's blind spots. Rather than developing an alternate method, or a slight adjustment to turn to, he won't, just like he won't have a rethink about Trent's role and trying anything different with him, he'll wait and wait for the right environment to see him flourish again.
It's like letting yourself freeze all winter, knowing it will eventually get warm again, because you don't like wearing a coat.