I think he also wanted an out. He just didn't want to do it anymore. Gene Roddenberry, like Bryan Fuller, couldn't seem to hold on to a series for long. The only two series of his that took off were TOS and TNG. In TOS, he bailed after two seasons. In TNG, he let his lawyer become too powerful and alienated everyone he brought on before the first season was over. After that, Gene Roddenberry's involvement decreased sharply, becoming a Figure Head by the end of the third season. Then there are the movies, where control was taken away from him after the first one. So, basically, Gene Roddenberry's real involvement with and control of Star Trek was two seasons of TOS, arguably two seasons of TNG, and one movie.
Alex Kurtzman, like others have said before, is like Rick Berman. He's the person who can mass-produce Star Trek for seasons on end. So, he's good now, at this stage... but eventually he'll wear out his welcome. It's just a question of when. Hopefully he quits while he's ahead, whenever that is. Something Rick Berman never did.
His contract is for 5 years (and $25m

). It's about whether the people above him choose to renew it at that time or not. With Rick Berman, Paramount (at the time) waited out his contract and kept cancelling his projects (like Romulan War movie
The Beginning) before handing the reigns over to JJ Abrams.
Personally, if someone offered me $25m I'd take it over and over, and eventually I'd be developing concepts that make
Space Hitler Georgiou the Section 31 Cannibal's Adventures seem amazing.
The fascinating thing about Alex Kurtzman is, that he is by all accunts
not a "creator" like Roddenberry or Rick Berman were. He's a craftsmen for hire. And pretty successfull at that. He never got any accolades as a writer or director - Transformers anyone? Amazing Spider-Man? But what he does - he follows orders, delivers on time, and under budget, and looking polished!
His only real personal big failure was "The Mummy" reboot, the supposed launch of the Universal Monster Universe. And in my personal opinion, it was
because he was too nice. Tom Cruise wanted to do a Tom Cruise movie. The higher-ups wanted set-ups for a shared universe. And both were higher in the food-chain, so Kurtzman delivered, instead of fighting for his own vision of
the actual movie.
We can see this with Discovery as well: Lots of fans were unhappy with certain things about season 1 (the klingon look, the focus on war instead of exploration), probably the higher ups too - and the show immediately course-corrected for season 2.
We don't know if S2 will be any good. But for whatever it's worth - the notes were implemented entirely.
I guess Kurtzman is going to allow the writers A LOT more leeway than we ever saw before on Star Trek. Just look at "Calypso". Under the reign of Rick Berman, that story would have been bent to fit canon. Under Roddenberry, we probably wouldn't have humans fighting humans in the far future
at all.
In the long run, this can turn out extremely well, or pretty poor for Star Trek: I think working on television - a more collaborative medium - is suiting Kurtzman WAY better than on movies. If he hires the right people, I trust him to let these peple creatively loose, while making sure everything is finished on time, under budget, and looks
great. This guy delivers polished looking products. I just hope his superiours don't fuck it up - if they give him useless and stupid notes, he will implement exactly that.