Thank you, now we are very close to the exact topic: A small group of core devs actually release the code, who takes over if they are gone?
Anyone in the world can take over the code and continue developing it and releasing it. This is the beauty of being open source.
The community will then decide if they want to use the new releases or not, based on what has been changed in the code (which should be again, publicly available).
So the question, as @Lucius also pointed out, is a non-question, probably meant to scare newbies.
TL;DR: There's no real issue there. Period.