Atleast they are putting in tons of effort. And they caught up on lots of things... they didnt even expect such a huge playerbase... not to mention the crazy amounts of patches they are pushing, which cost alot of money. Most games have you wait for months for updates or fixes. Atleast they bother to straighten things out asap and pushing the updates...
Fortnite will be fine imo. They just juggle everything at the same time, new content, fixes etc... nonetheless its a pretty solid game and imo will last for quite a while