Yes, all discussion about the future is speculation, including your claims. Something as big as Twitter is less likely to get thrown away, sure. But it is shrinking, and could well shrink further.
There's also a big question of who might buy it. The first time Tumblr got sold, it was for $1 billion. The second time, for $3 million. And the receiving organization has been putting a lot of money into it trying to create a viable business. It's perfectly possible that nobody with the money to buy and run Twitter would actually want it. Twitter was available for sale for many years, but was never purchased except by somebody doing it for decidedly non-economic reasons. Consider how Disney decided not to buy it, for example: https://www.vox.com/recode/2022/9/7/23339402/bob-iger-disney...
For many organizations, Twitter is brand poison. It'd be a continuous source of bad PR. And with some of its key assets destroyed or lost, plus so much negative press, it's going to be at best a fixer-upper. And what would they get out of it? It was never a good business even before the Threads launch when it had no serious competition for its niche. I have a hard time imagining who would pay for it even at fire sale prices.