SMTV is a priority for them. It using UE4 and all the assets being created for it will probably get used a lot in future MegaTen games. The SMTV investment isnt just for one game.It's entirely possible that budget and staff could have been diverted to focus on Project RE:Fantasy though. Whatever Hashino cooks up as an IP could have a much higher priority than the entire Shin Megami Tensei series, which will never be able to break away from its niche audience
I don't think they'll divert anything for a unproven IP even if it comes from an acclaimed studio.