I agree, which is why I can’t see us selling Diaz and Salah. But Edwards and Hughes may choose to really revolutionise the squad in the post-Klopp era and make some big changes.
I think the issue is the paucity of high-level production in the potential replacements. Would the conversation be different if there was some obvious 35+ G+A young wide forward in a top league? I can just see the logic in selling Salah, not saying we should.
There's clearly a conversation to be had if some Saudi team comes in and offers £100m+ for Salah, but I honestly believe he wouldn't have any desire to play in Saudi - this is a man who will still believe he's one of the very best in the world and has loads more to offer competitively to be effectively retiring at 32. In 3-4 years, sure maybe I can see him heading there and rinsing them for a nice retirement gig, but now? Despite the concern last summer around largely past-it big names and the odd younger player flocking there, no-one watches or gives much more of a shit about the Saudi league than they did 3 or 4 years ago. Salah isn't going to want to go there right now, I don't think his ego would allow it. Not when he can probably still get good money in higher profile European leagues for a few years yet (unlike Ronaldo).
I can see it being a bit of a tricky situation actually - I'm sure the numbers men will have little appetite to renew him for a further year on £350k+, but I'm sure they also won't want to let a valuable asset leave for free next summer, and I'm sure with the departure of Klopp, Salah will maybe be looking at it and thinking now is maybe the right time to move elsewhere. But the only place that's going to pay silly money for him with a year left is Saudi, where I don't think he'll want to go. I can see him maybe sitting out the last year of his contract and signing for a PSG/Madrid/Barca on a free to be honest. Which is probably the worst outcome for us.
Diaz, I dunno, it would depend on who we were looking at to replace him really. Like you, I think if it's less than £70-75m I'm not sure there's much point, and I'm not sure I see anyone offering that. I really hope Barcelona don't try to unsettle him then low-ball us, but with over 3 years left on his contract we probably hold all the cards there for now. Then again there's also pretty big question marks around what system we'll be playing next season, and from what I've seen from the various analysis I've seen I'm not sure Diaz is an obvious fit in Amorim's current set-up - if that's who we go for, and we can bank £60m odd to go for a player who does fit, well maybe it makes more sense. As you say though, trying to replace both Diaz and Salah in a 12 month period would introduce a lot of risk, and I think there's still plenty of questionmarks around Gakpo's future here too. Then again maybe we just bite the bullet now - there's bound to be a level of upheaval this summer anyway.
Hard to really know until we have a new manager in place.