As a former "PC elitist" turned console gamer (except for SC2) I don't think this is a good idea.
This game was made for consoles, it's awesome on consoles. The controls work extremely well on consoles. I think it would be very hard to make a PC version that has the same feel to it.
Not to mention the thousands of posts on here complaining about "consolitis", I wonder how many a Dark Souls port would spawn?
Also, on the topic of difficulty. To clarify, yes the game is hard, but it's not hard as in "this is impossible I'm breaking the disc", it's hard as in "ok, that didn't work, let's figure out what does work".
A good analogy in my opinion is raiding in WoW (yeah yeah I did that). First you have to figure out a strategy, and (if the enemy is hard) you have to practice until you can execute it perfectly. Sadly few situations in Dark Souls require perfect execution, compared to Demon's Souls (in my opinion). You can actually take a couple of hits from most bosses. The few bosses that are hard though, are awesome. I'm not saying which to avoid spoilers
Oh, and, the game is awesome, play it if you haven't, get past the beginning and you'll be hooked. And DO NOT read any wikis or use google. At least not for the first run through. And play Demon's Souls too.