If you're a fan of the film, its worth it.
Apparently the PQ isnt anything fantastic but its still the best you'll probably see for a long time, as like you say the chances of a re-release is pretty slim.
Plus if you are HD Audio ready, the review here says the AQ is a 4/5 which is great.
https://www.blu-ray.com/movies/Tremo.../14445/#Review