I think they are doing things to accommodate James - they're doing songs that have less singing and more instrumental breaks, songs that don't go so high, the backing tapes have been ramped up a bit, etc. He still sounded like he was on 40% battery at my show this year, and the more time went on during the set, the worse he got. The show reviews all say it was hard to hear what was going on due to the famously bad arena sound at this place and the amount of backing tapes and how his voice was placed in the mix, but imo if you have good ears and you were specifically listening for that, you would have found James not sounding his best.
If his only problem was the highest notes, they'd probably just go down a semitone on everything, since they showed willingness to do it for the IAW Beyond tour, but that didn't help him much. It's just that singing Dream Theater songs is hard and his level of vocal agility is going down with age, despite his work to get the best he can out of his voice. He probably also likes the way he sounds as well, and thinks all the notes he does hit make up for some bad phrasing and odd turns here and there.
I don't think there's a situation to be addressed necessarily. There will be, what, maybe three or four more DT tours tops? On the show he was also warm and engaging in his own slightly stilted but funny way
and everyone seemed to be having a good time. It's nice to see Dream Theater from up close and there's many aspects of the show that aren't exactly the same as they were, not just James' voice.
I wouldn't put anything (up to replacing JP) past DT, but clearly this is just how this is going to be happening, with James receiving maximum help that the regular concert goer wouldn't necessarily notice so much - conservative changes in tuning, backing tapes, setlist choices, et cetera.