I mean it is, but it might be less costly than continuing on the proprietary engine. CD Projekt and Halo both cut their losses and moved to UE5 as a compromise moving forward .
If CD Projekt, creators of one of the best RPGs of the last 20 years, thinks they can benefit from an engine switch I’m inclined to think they might be right.
Elder Scrolls probably fits this category as well - not as much as Call of Duty but Bethesda probably has amongst the best RPG sales of anyone. They sold a hilarious number of copies of Skyrim alone.
As long as you aware that’s an unpopular opinion, then it’s yours to have.