The DUAL players are the only answer.
We simply cannot have a situation where you are unable to buy a specific movie just because you have HD DVD and not Blue-Ray, or vise versa.
What usually happens is that one format backs down, just like Beta Max. But now Sony is stronger and they aren't going to go down. And HD DVD is cheaper so at least some companies will take it on.
Soon enough they will have the features, and by then they will be cheaper aswell.