Once clubhouse loses its exclusivity and becomes generally available, where will they be at? It's essentially just a discord clone with better marketing and hype. Or, in its most common format of 1-3 people talking and 1000s listening, it's basically FM radio. Is that enough for it to be widely successful (the "next social media platform")? I'm not convinced.
The biggest features it's got going for it once it hits GA, are that it's ephemeral and that it's live. There are several other platforms with decent UX already providing these USPs, also for free. I can see this being a live-streaming broadcast service for celebrities and influencers who already have big audiences, but not much more than that.