Carl said it well. "Buy or wait" is a complicated, personal decision. OTOH, I hate to think of yet another person wasting endless hours trying to get to the bottom of this issue. So, FWIW, after endless hours of research, I decided to delay my purchase of a new display until later this year. My rationale for doing so will not apply to everyone.
Good reasons to wait for a DVI/HDCP-equipped (or Firewire/DTCP-equipped) projector: You appreciate the additional detail and clarity afforded by an all-digital system; This will be your main projector for 7 years or longer; You like the idea of "renting" movies over cable or satellite instead of going to the video store; You are a cautious person and you're in no particular hurry to buy a new projector.
If you flip each of these around, you'll have a list of good reasons NOT to wait.