We should insist that players for past formats remain available at a reasonable cost, forever.
That really isn't a viable business model. Hold open manufacturing centers for the thousand people who had VHS decks die during that year.
One of the things I've enjoyed about upgrading is handing off the older format to others. As I bought each Blu-Ray season set, my sixteen year old daughter would come ask for my copy of that season on DVD. I have a two and a half year old son that loves Star Trek. Imagine that when Blu-Ray is replaced, I'll be handing my Blu-Ray sets over to him.
I think the Blu-Ray sets have offered the best of both worlds for TOS fans. I really couldn't ask for anything more.