In TMP, I liked the idea of Decker in command, with a couple of new faces on the crew, whilst keeping a few legends onboard to see them through.
The later films, it just seems kinda nuts that they would still be serving together for thirty-odd years. Spock was a Captain in his own right, he should have had an Oberth-Class science ship, maybe taken Chekov along with him. Scotty should have transferred to the Excelsior
, with him onboard then transwarp would have been a success. Sulu should have had a ship of his own by TWOK, maybe the Reliant
, though he'd survive the encounter with Khan. Uhura could have made Captain, or at the very least XO. Leave Kirk on the Enterprise
with Bones for company and a new crew of ambitious go-getters.