When they announced that 5e was to be absorbed into “1 D&D”, it was actually pretty ominous if you think about it.
But 5.0 will live on, just as B/X and AD&D have. And your books will still work, just like before!
Yeah, I think at the end of the day, even if in many ways 5e was a "compromise edition" or "everybody's second favorite" or whatever, too many people (me for the most part included) came into the hobby or came into it full force with 5e D&D for it not to live on as a nostalgic touchstone. And there are lots of materials published for it, many of which are associated with other things that will doubtlessly kindle nostalgia ("oh my gosh, my old Tal'dorei campaign setting book! Remember classic Critical Role? Let's play some 5th edition!).
And yeah, there will be 5e clones. I don't know how soon people will be able to get away with creating one that is actually compatible enough to run with 5e modules, and captures that 5e feel (and heck, I'm not sure I'll know what "that 5e feel" is until I'm playing games that vitally lack it), but there will be lots of 5e clones and quasi-clones and eventually one or several will hit the sweet spot for a lot of people.
And as much as D&D is in a bleaker spot now than it was a short time ago I think it's a little misleading (or at least ironic) to discuss it in terms of the "death of 5e", because, setting aside its future nostalgic zombie existence, the newfound unwillingness of so many people who readily would have jumped on to 5.5 to further patronize WotC has probably actually substantially extended the lifespan of 5e as a major game, and probably even as the most played game, until the right new challengers come for the D&D crown. Whereas before I imagined most 5e players would be switching to the new system by 2025 or so, I now won't be surprised if it is still the most played TTRPG in '26 or '27 (probably ultimately being dislodged because WotC, upset over the failure of 5.5 and still not understanding their customers, will doubtlessly be using creepy tactics to actively kill and bury it).