Exactly, we won't have anything useful until the masses get to use it. Its like sound blaster or GPUs in the early days, you didn't need one, but once they became common, we got more software and use out of them.
Why? Genuinely asking. Did you mean because there are free alternatives to self-host? I don't think that it would be so easy for someone in the market for a WYSIWYG blog builder to set everything up themselves.
Exactly. Because of the abundance of the one-click deploy WordPress offerings from value providers like OVH / Hetzner I would think margins are very low for WYSIWYG site builders.