Also STI shut down mid Saturn gen, after the collapse of X-Treme and the end of their collaboration on Die Hard Arcade. Sega of America lost a lot of what they had had.
The developer of X-Men 32X, Scavenger, did publish two games for the Saturn and PC though, Amok (which as I said I think actually did start on 32X) and Scorcher... and then went out of business due to other problems i think.
But overall, whenever a platform dies some games get moved to other systems, but others just get dropped, presumably because the additional cost of porting over the game was determined to not be worth it. That's probably what happened here... that or Sega of Japan didn't care about Western games much and Sega of America had less money and between that and added porting costs it was dropped. Kind of too bad, but a lot of 32X, Virtual Boy, etc. projects ended up canned, sadly.