It's the question we all wonder about. My personal take: Satoshi absolutely believed it could succeed, but probably not at this scale or this fast.
Maybe he knew but at the best is to go off grid. If Satoshi has been alive or active online, there is going to be doubt and FUD all over the internet. Look at Macheal Saylor strategy, I don't know him enough to vouch for him but he didn't have intension to sell Bitcoin but there are people on watch that are going to sell before Strategy sell 1 Bitcoin, that's going tj be the faith of Satoshi anytime he moves the Bitcoin he hold or might even be accuse anytime wallet with old Bitcoin is moved.
Bitcoin isn't longer a one man thing, even Satoshi doesn't have a mouth in Bitcoin one to be a state man, but he can been a full time contributors. There are many developers that has done a better job for Bitcoin since Satoshi left, it's going to be unfair to take their place but I know he wouldn't bother coming online.
Good point. Satoshi disappearing was probably the best move for Bitcoin.
If he were active now, every tweet or transaction would cause insane market panic and media frenzy. By leaving, he made Bitcoin truly decentralized no leader, no single point of failure or influence.
You're right, it's not about one person anymore. The developers and community have carried it forward. Satoshi's greatest legacy might be leaving and letting Bitcoin grow on its own.
Going off-grid was the ultimate proof that Bitcoin belongs to everyone, not just its creator.