Cheerful Charlie
Contributor
From a program standpoint, it might be able to just coast for a long time. Depends on what kind of server maintenance it needs to do regularly, and what kind of bugs are out there.
But there are issues beyond the code. Like how they now only have one person working child safety for the Asian-pacific team.
Because of past issues they have to have any new features checked for proper security by agreement with the FTC, but twitter no longer has anyone to handle their side of complying with the requirements. Heck, the HR department doesn't even have the personnel to properly handle everyone quitting/fired and the attempts to get back the people they realize they actually need.
I read a report on Hacker News from an ex-Twitter engineer. Twitter's servers are well designed, have a great deal of redundancy and are very robust. Twitter has 2 server farms, and one could go completely off line and Twitter would still operate. So, yes, Twitter could theoretically collapse as its unmaintained servers slowly degrade. But do not expect that to happen any time soon. Twitter's main problem now is old advertisers leaving in large numbers.