They should just remake Grimoire from scratch. The current iteration isn't worthy of being the only game in years that advances Castlevania lore.
Sadly they won't do a proper ClassicVania or Metroidvania for the same reasons Riot Forge got shut down.
The people-in-charge at major corps don't know anything about videogames or what makes them good.
Put them in front of Redfall and Hollow Knight, and they'll think Redfall is the better game because it's 3d and has a higher budget.
Also it's greed. According to the leaks at Insomniac, Spiderman 2 did cost 300 millions to make. Companies prefer to make 1-2 high budget, extremely risky games than 100 low budget, low risk games with guaranteed profits.
Companies also imitate other companies so now Konami too has an animation studio.
Think we need a large shift in the industry before they make another game. The giant 3d open world movie game snozefest that goes since 10 years has been already showing some cracks...