Is the world out of ideas or solutions?
The world might be for the moment, but the scammers and profiteers won't stop coming up with worthless ideas they can leverage to steal people's money. They're just going to keep coming, believe me.
I am sure there are many other potential coins like Eth.
Man I hope so. There really hasn't been something like Eth coming along since it actually did. Neo is a close second to Eth in my opinion, but the smart contracts really haven't been used for anything that is actually useful. That doesn't mean the platforms will never be used for something good, just that we're in a very dark period right now.
Even though there are more of scam projects launching from 2018 till date, we still have a few projects with superb development.
I noticed that you didn't bother to mention any of them by name. I'd love to hear what you consider to be superbly developed projects, because damned if I can see any of them.