Within a decade FB will be the next dying messenger and the world will have moved on.
Facebook the company or Facebook the platform? The thing with Facebook owning Instagram is even as Facebook itself becomes less and less relevant to younger generations, the company still owns the platform those younger generations favor. And as Instagram inevitably becomes itself irrelevant, I'm sure Facebook will just buy the next social media platform.
TikTok is what the kids are using now - and they're valued at about half of what FB is valued at, so unlikely that FB will be able to buy them.
Maybe FB will buy whatever replaces TikTok.