Err, didn't you just compare MySpace and Facebook by looking at their MAU?
The questions for continued relevance is if Facebook-the-company can continue to iterate Facebook-the-product, or if its codebase has grown too unwieldy, and the company's culture gone toxic, making it harder to add a feature to Facebook, compared to creating a new company, writing a bunch of code, buying content and acquiring users. Given the rise of Instagram(Acquired), Snapchat (IPOd), WhatsApp(Acquired), TikTok, it's not clear Facebook-the-company is able to innovate. It's not clear that they have to, either, given older Internet brands like Yahoo! are still around and making money.
The comparison I'd make is to email. There are reasons email will never die (along with reasons why email can't innovate), and I think some of those reasons also apply to Facebook by this point. There's just some percentage of people that won't ever move, so while, eg, IRC is no longer in its heyday, it's still alive and kicking.
The questions for continued relevance is if Facebook-the-company can continue to iterate Facebook-the-product, or if its codebase has grown too unwieldy, and the company's culture gone toxic, making it harder to add a feature to Facebook, compared to creating a new company, writing a bunch of code, buying content and acquiring users. Given the rise of Instagram(Acquired), Snapchat (IPOd), WhatsApp(Acquired), TikTok, it's not clear Facebook-the-company is able to innovate. It's not clear that they have to, either, given older Internet brands like Yahoo! are still around and making money.
The comparison I'd make is to email. There are reasons email will never die (along with reasons why email can't innovate), and I think some of those reasons also apply to Facebook by this point. There's just some percentage of people that won't ever move, so while, eg, IRC is no longer in its heyday, it's still alive and kicking.