I think a remake would be great. I know many who won’t play System Shock 2 because of its outdated mechanics, comparing it with Bioshock even. And really, when it comes to how well implemented some mechanics were, Bioshock is light years ahead (even System Shock 1 had some things that worked better there, most of them puzzles). All skills, or at least many of them, feel useful and have tactical depth, something System Shock 2 lacked when it came to Psionics. Not only this, but System Shock 2’s gunplay was pretty rudimentary (even though I don’t feel it is that bad, it’s so much better than Deus Ex for instance), if you compare it to Half Life, that came even earlier, it is just bad. Not to mention the horribly implemented degradation mechanic that could have been left out of the game as it doesn’t make that much sense, disconsidering some fan theories. All in all, I think a remake would be good as in updating the game’s graphics, some of its mechanics such as Hacking, Cyberspace, any other puzzle solving (anything dependent on luck is BS), balancing out everything stat-related and also some of the guns that were lackluster, making psionics relevant and tactical, working on the last levels of the game so that they’re non-linear, just like the rest, and maybe adding some more things, if possible, like a bigger roster of enemies.
A System Shock 2 remake would be really good in my view, those who didn’t play it back then and aren’t up to play it nowadays would have an option to go to, and it would be an awesome experience to those who have already played the old one, pretty much like it will be with System Shock 1’s remake. In the end, we’ll still have the classic one should a remake not come up to our expectations.