Mick Schumacher has the backing of Ferrari and if he wants also of Mercedes, Ticktum has the backing of Red Bull
Regarding the superlicence it's true that they changed the rules to prevent this but it's got nothing to do with drivers' ability or maturity, it's just that GP2 had lost any meaning and most teams were risking going bust.
In the past it was perfectly normal to go straight from F3 to F1, to name but a few WDCs Piquet, Prost, Mansell (if I remember correctly), M. Schumacher, Senna, Vettel (with only a few races in formula 3.5), Hakkinen