If, as a lot of people afre thinking, we get 3 car teams in the next few years, maybe they could provide a route for younger drivers by bring in a young driver rule.
The GP2 champion would get the 3rd car of the F1 WCC
The winner of WSR would get the 3rd car of the F! runner up
The winner of GP3 would get the 3rd car seat of the 3rd place team
The F3 champion would get the 4th place team 3rd car
then the runner up in each championship would get the 3rd car of theams from 5th down to 8th in F1
That way there's a clear reason for winning GP2 and WSR, instead of ending up in limbo.
Yes, I know there's be a few sponsorship issues, if for example Alex Lynn wound up at Ferrari, cos he;s backed by Red Bull, but drivers are placed in other teams now, so I don't see that as a major issue. I'm sure there are other issues to overcome, but at least there's a clear ladder if the teams were forced into this