The fifth TNG movie that never was

Spiner himself explained,...

https://memory-alpha.fandom.com/wiki/Undeveloped_Star_Trek_projects#Nemesis_follow-up

Undeveloped Star Trek projects

Many projects have been partially developed for Star Trek, beginning in the 1970s. There have also been deleted scenes for completed projects. The God Thing (1975) Star Trek: Planet of the Titans (1976-1977) Star Trek III (1980) Star Trek: The First Adventure (1989) Star Trek: IMAX (1997) Star Trek: The Beginning (2005) Star Trek 4 (alternate reality) (2019) The notion of a Star Trek film was originally considered amid the making of TOS Season 2, while DeForest Kelley, Gene Roddenberry, and Greg

Memory Alpha

Maybe instead we have an army of Datas vs an army of Nomads from TOS and they have a big robot fight like in the last Avengers movie.

Or really go off in a bizarre direction and time travel back to a long time ago in a galaxy far far away and team up with R2D2 and C3PO to help fight a team up of Darth Vader and the Borg.

I could go on...