That doesn't in turn mean the next 5, 10 , 20 years are set in stone.
I look at all the realistic options aside from Poch and don't see a single name that I would have any realistic expectations of doing a better job than him. Other than Nagelsmann .. who I struggle to see actually coming here.
Beyond that its who? Rodgers, Potter, Slot, Kompany, De Zerbi, Amorim? None of these are bad managers, but I'd rate their chances of besting Pochettino's work as low at best.