I think we had this. I distinctly recall busting my chops getting back to Sierra 39 to buy more crew for extortionate prices because without crew I was being treated like Loki when the Hulk picked him up.
I don't think that is a good idea. There are time when I just go back to ESD to stock up (easy with transwarp) and get "stuck" in a fleet of ships that I CAN'T even approach the starbase. Can you imagine when you make it a requirement?
Growing old is inevitable. Growing up is optional.
Permanent Crew Loss was the original idea: you had to return to a Starbase and buy new Crew. It was never implemented, and the way the game is now most people don't like needing to return to a Starbase for anything - which is why so many functions are now on Ships. People hate unnecessary travel time.
STO is about my Liberated Borg Federation Captain with his Breen 1st Officer, Jem'Hadar Tactical Officer, Liberated Borg Engineering Officer, Android Ops Officer, Photonic Science Officer, Gorn Science Officer, and Reman Medical Officer jumping into their Jem'Hadar Carrier and flying off to do missions for the new Romulan Empire. But for some players allowing a T5 Connie to be used breaks the canon in the game.
**** this is actually the worst idea I have ever heard of! Carrier ships lose all of their crew well before most STFs end, so you would likely be left fighting Dontra or a Cube with no hull regeneration, just buffs.
If you have to go all the way to a starbase to get new crew, it would become increasingly tedious. And what about the existing consoles that help crew regeneration? They would just disappear.
DO NOT IMPLEMENT THIS. LOL.
'A few deaths are a tragedy. A few million is a statistic.'