Solidity is a small language and outputs are typically small due to gas limitations, so I doubt companies will be recruiting for it as primary, they'd be looking for smart developers with a lot of exposure to blockchain like technologies and multiple languages and years of experience in order to write safe performant Solidity where required. I'd be concerned about hiring someone calling themselves a Solidity developer unless he/she was working on the VM, then again I don't rate any people that identify themselves by a particular language or worse a framework or the junior/senior title 'Senior ASP.Net MVC C# Frontend developer' - yuck.
I also doubt Ethereum will win out, network got thrashed by cryptokitties, and apparently in some really perfect circumstances can handle a whooping 25 transactions a second, here's to dethrowning visa and unbanking the poor. Even anti-immutable Vitalik Buterin is having his doubts - see his twitter.
As he has mentioned, knowing solidity can give you an edge in a company that wants to write ethereum contracts, but that generally means it isn't like a day job, you can also freelance for companies that wants it.
Don't consider his opinion about the success or not of ethereum, smart contracts are there to stay and even if you code in another platform in another SDK the basics will roughly be the same. But anyways, I believe ethereum will thrive, nobody actually said that Ethereum was scalable enough anyways, everybody knows its limitations but instead how about looking where it wants to be? :-)