Yeah its true, many potential players are left out in the cold, that's the real draw back. We are thinking about creating a low resolution package-- if I'm not mistaken it's possible to export and import a lot of data between projects so it might take a lot of the work out of it. (I haven't really looked into this yet so I'm not a 100% about this).
But at the same time, someone who will not be able to play it immediately will probably be able to in the near future when he/she upgrades, or at the very least play it on a friend's monitor. We are not making a game that rests on special effects and hype to deliver millions of units in the first week of release, if the game is good it will hang around the scene long enough so everyone can play it, I think. Things move slowly in the adventure game world, so I thought it might be wise to do a little future-proofing with a high resolution.