OK, so maybe this decade's Laserdisk?
Last decades, perhaps. 2003-2008.
I'm waiting for 4k stuff to become standard. The "4k blurays" right now are still only 1080p, but encoded in such a away so that 4k bluray players can upconvert them with better results than upconverting a typical 1080p.
The real 4k discs and players aren't here yet, and while you can get a 4k TV, they aren't capable of 2160p60 yet - still only doing 30 frames a second over HDMI. The next version of HDMI was just announced in September, so expect to see a lot of 4k TVs popping up next year, and eventually the players and discs to showcase them.
Then bluray will be old and busted, DVD will be compared to VHS quality, and VHS might as well have been the stone age. Blu ray will probably receive an upgrade, though, enabling 4k movies to be played on it. I don't expect a completely new disc just for 4k.
And then we can buy LoTR all over again in the super special 4k limited extended edition... pack... thing.