if Twitter dies I don’t think I’ll seek out a Twitter replacement; i spent several years really going hard on Twitter (which was great, I don’t regret it), but I’d rather restructure my life altogether. I can still contact people on Instagram etc for basic 1-1 social needs; beyond that I’d write essays, make 

Agreed, even as much more of a listener that's what made Twitter special and I doubt it will replicated soon. Staying as well and have little appetite for relative similar replacements like mastodon. 
I'm hoping Farcaster can be part of a much more networked future that's more distributed but too early to tell.

Searchcaster