Ballooning budgets are a real concern though. I can't imagine what a GTA or Elder Scrolls game will cost to develop on Series X / PS5 with RDR2 being $250-300 million...
BGS open world games are actually much cheaper than many others I think, due to being more systemic and less content heavy. The next GTA on the other hand probably has a good shot at being the most expensive game ever (at least #2 after Star Citizen), though they will still be profitable.