Nothing's stopping you from playing the media you already own, so no.
Even when studios stop publishing Blu-Rays, I'm pretty sure you're still gonna be able to buy used (and dirt-cheap) Blu-Ray players for a long, long time.
I don't think this is part of any larger plan at all, except to discontinue products that consumers have basically stopped buying, which is what any business does.
A lot of people rip their Blu-rays, there are many hoarders with NASes full of rips and exchanging them via torrents. Preservation is being taken care of in that sense, as long as there are people with that hobby. The problem is for other people to get access to that.
Sure, but with bit rot you would have had to buy a new disc anyways.
Preservation is a totally different subject. It's an ongoing challenge that is nothing new, and something librarians and archivists have made an entire profession out of.
Although these days, preservation is actually astonishingly easy for end users who store media in major clouds like AWS, since the cloud providers take care of eternally ensuring redundancy and re-copying data to new hard drives as soon as old ones fail.
Even when studios stop publishing Blu-Rays, I'm pretty sure you're still gonna be able to buy used (and dirt-cheap) Blu-Ray players for a long, long time.
I don't think this is part of any larger plan at all, except to discontinue products that consumers have basically stopped buying, which is what any business does.