So why are you obliged to buy some 4k stuff? The blu has not even had its decade, so keep calm. Do not do everyting the industry is telling you to
. By the way, I do not think the physical discs have a great future, they will get and keep their niche with collectors, but most 4k and other movie stuff will completey go to the streaming world (where users more easily can be supervised, remotely controlled and forced). Just sit back and enjoy time.