I would hope Blu-Ray would stick around for a while. Considering I'm just now starting to adopt it.
It probably will. The infrastructure needed to have a higher resolution than HD will take years to develop and implement, if there's even a will for it. The next thing you'll see studios pushing is Blu-Ray 3D, but I just don't see people seriously adopting it. I only have three titles in the format -- one came with the player, and the other two were gifts (that also have the 2D version of the movie).