I have mixed feelings about Kirk's demise in GEN.
I agree that his final words, "It was fun...", reflected the charismatic personality and life of the character. And, at least, it was fitting that Kirk went out heroically.
However, Kirk's simple memorial seemed almost like an afterthought. Kirk was the iconic captain that helped make ST a scifi pop culture phenomenon. As a fan of ST, I thought the character deserved better. Nobody from TOS was there to see him off. Just one solitary person was there, Picard. It was underwhelming.
The only other main TOS character who died onscreen in a ST movie was Spock. When Spock died, Spock got a memorial with pomp and circumstance. Nimoy/Spock even had the honor to voice the concluding, "Space, the final frontier..."
And the irony was that Spock came back to life. He got a big sendoff even though he eventually came back to life. Unless Shatner's Kirk appears in a future ST movie, GEN would be the last time for Shatner's Kirk.
I realize that GEN wasn't a TOS movie; nevertheless, I still think Kirk should have had a more fitting final tribute.