Anything related to Elon Musk, after buying Twitter, of course, often becomes trending and makes many people want to know the latest news, and in my opinion, if someone resigns from work, it's normal and often happens, don't worry, because the team will look for suitable or better candidates. than those who have resigned, and with a salary offer that is of course large, it will not be difficult.
in every change of ownership, it is certain that there will be a reshuffle and that is only natural and everyone will definitely experience something like this, including Twitter. if it is not replaced it is likely to resign because there is no match in every step of the new owner.
as you said, that there will always be new candidates and you can be sure they will have the right specifications, and there is nothing to worry about even though they might only have an effect at first and will work well in the future.
if indeed the replacement candidate is taken from someone who has no experience in their field, of course it will later have an impact even though there will be corrections in the future.
Elon Musk is indeed a proven businessman and will be able to handle everything well even though there may always be things that could go wrong but the possibility for quick corrections can be made because of his proven reputation to date.