Huh? I bought in to DVDs very early and I've either owned or used many DVD players over the last decade, and I've never, not once, had an issue with DRM preventing me from using the disc in a dedicated player.

The only situation I can think of is that you bought or moved your DVDs from a different "region." And the number of people actually dealing with that is so small it's not even worth mentioning.

Perhaps you meant Blu-Ray? While issues are perhaps more common, they're not common enough to drive people away. BR's sales problems are due to high cost and poor timing to market.