Doesn't need a remake, just a remaster. Hopefully they didn't lose the 3D model files unlike Square-Enix.
Please don't leave Baten Kaitos Origins out of this as it's the best game in that series.
EDIT: Xenoblade 1 on Switch is NOT a remake, just a very enhanced port, so I really hope that if this is true (I doubt it!) they'll just take the original game and tune it whenever it's needed.
Namco needs to agree with it, as Baten Kaitos is probably still a Namco IP and on top of that has some Namco IP that would technically have to be licenced or changed (some
Tower of Druaga sections) but they have otherwise, nothing to do with it. Might I also add that Baten Kaitos wasn't solely developed by Monolith, tri-crescendo was in as well.
EDIT2: Baten Kaitos on top of being a beautiful game, had some novel ideas, the card system was off-putting on paper but worked really well, and there was aging for the items. for example, pick some green bananas (a green banana card) wait long enough and it'll be yellow, then black bananas. This applies to plenty of items and these transformations are part of the game system and quests.
The localization and voice overs were shit though. I remember for the first english trailer they hired better actors, then had to basically downsize everything and the game as a whole suffered greatly from that.