I don't think Twitter would fall. Elon may have made a decision backed by many to fire some former Twitter employees, but it would take like between 5years to 7 years to determine if his new company, Twitter would stand the test of the seasons, before considered as a failure.
Although, Mark of Meta has launched a competition network in the name of Threads, just to wake Elon from his slumber of just owning a company, it is yet to be seen what Elon has as reply to this and what new incentives he is incurring to see that Twitter isn't a failure in all entirety.