That is the only likely future ahead. BS is growing so fast that there’s no way they can sustain this growth even if they add ads. The only path forward is selling out. I think Microsoft might be interested in finally owning a popular social media site.
I didn’t say MS would make it successful. They would definitely buy it, add Minecraft to it, integrate teams, then forget they bought it, neglect it, and leave it more broken than when they found it.