That is one thing I do agree with. By releasing the game on DVD, people will upgrade their computer to play the game, just as people started buying CDs over casette tapes. DVD is the way of the future. In fact, it's already been superceded!
Although, an optional install is possibly better as DVD drive speeds are still absolute crap compared to modern hard-drives and there's no way you'd be able to put all the data you need sequentially on the disc. One thing I can't stand is speech skipping because my bloody drive is getting up to speed.
