Falci: Man, these are games that need a modern remaster. All 4 of them.
babark: I can't really think of a way a modern remaster of Mortal Kombat 1, 2 or 3 wouldn't be much worse than the originals.
If it is just mechanics you feel need a remaster, then just play one of the latest games in the series.
Oh, but I know it.
I have the latest 3 games in the series and, to me, they're the only really great games in the series. These classic ones were good for their time, but aged terribly. And, frankly, these last three have all been about "Hey, remember this from the original classic games? Here's it in glorious high resolution!"
I know they'd probably go for the lazy port in a bundle of the games, like they've done before, but if they could just add a bit of effort, it could make for a great and definitive way to play the originals.
If they went for the full blown remake with modern graphics, I think it would be awesome, but... probably an inferior version of the newer games in the series.
And, as TheMonkofDestiny said, MK9 IS a remake of MK Trilogy (with an art style that aged horribly) and is way better than the originals. Technically, MKX is a remake/reboot of 4 as well.