The idea being we're a few years at least before language and infrastructure can be mature enough to have value for most users beyond earliest of adopters. The other languages you've mentioned are much further along than any "dApp" platform at what they do. Decentralized application platforms like Ethereum are a new space with new requirements but, as far as I can tell, necessitate a new language to satisfy unique requirements. The hot-take is that Solidity is probably going to take some big changes to make it much further. I've not been impressed with it.
> we're a few years at least before language and infrastructure can be mature enough to have value for most users beyond earliest of adopters
There isn't really a clear explanation of why that would be the case. The bottom line is that smart contracts require a trusted oracle to feed data into the system, at that point, the advantages over a centralized system are essentially zero. There is no reason why anyone except enthusiasts, tinkerers and criminals would get involved.