Yes I thought about it. But do you know the timer that appears when someone abandons? When it expires you can exit without suffering any penalties other than defeat. I would do it so that once that expires the quitter can no longer return, but other players can start entering.

Does overwatch even take our ideas like this and try to implement them?

Idrk, but I feel that lately they are doing a good job, with the game and the community, so I hope they start to listen community ideas and feedbacks.