Why does everyone panic? Didn't Bethesda mention, that Starfield will release prior to Elder Scrolls 6 and that even Starfield is still far away? That probably means, that Starfield won't be released before 2022 earliest and the next Elder Scrolls maybe in 2023? and it's still possible that we will see both on PS5, maybe with a delay of 6-12 month? Aside from that, if you really want those games and if MS actually decides to not offer those games on PS5 at all (still not sure about that, it's some nice extra money and MS usually doesn't care on which system people play "their" games) you can still buy a gaming PC or Xbox Series S or X depending on how much you like to spend. In 2-3 years the system is most likely cheaper already, especially if you consider price drops for the Xbox One (X) in the past.
Worst case you have to dish out like 200 or so for an additional system in 2-3 years, if you really want those games, I mean I could live with that? I might buy the Series X in 1-3 years anyway, just to enjoy Forza and stuff again.