The advertisers will return eventually. I'm anti-elon and anti-twitter, but as much as I would love to indulge in the schadenfreude, the collapse of twitter seems totally unrealistic.
It's not like HN or sites like 4Chan require a lot to keep running but if Elon is hoping to get some return on his $44billion then that now seems very unrealistic (which based on his desperate and now-defunct 8$/month subscription scheme I assume he is)
The only way to fully replicate Twitter's ability for anyone to potentially address the entire world is to, well, replicate Twitter. No alternative (including, meta-speaking, Hacker News) suffices.
With the exception of the ideological concerns, all the problems described in the article can be eventually solved with restaffing.