The redshirt thing really doesn't have an impact.
If a kid plays 4 games next year and decides he wants to transfer....he still has to sit the rest of the year and the entire 2020 season as well so he is better off just playing the whole 2019 season and then leaving...which is really no different than things have always been. The exception being if they can find a school (like org st) that hasn't started classes yet but that will be a tough find 4 games into the season.
I doubt it will have an impact on this particular player, but I don't agree that it doesn't have any impact. In the right set of circumstances with the right player, it could be a driver in a decision to transfer.
I'm hoping more kids will want in that will want out in the coming years, truth be told.