Solidity is pretty horrible and the development tools for Ethereum aren't very good. The problem is that the alternatives will have even less. I don't know about EOS but Tezos will have to build libraries. Without libraries we cannot do anything as a programmer without reinventing the wheel. Libraries allow programmers to get things done in a safe way, following best practices, and Solidity lacks maturity in that area which led to The DAO.
JS would be a horrible choice for security but it is probably better than Solidity which is to say, Solidity isn't any better but has less tools and maturity.
That was kind of what I was thinking - better the devil you know and all that. I think I generally get nervous when any single "basket" has so many eggs placed into it - it is better to have more competition.
Your right. Solidity and Serpent tools were really lacking last year. They are getting much better. Visual studio support etc... EOS and Tezos (ignoring the IP issues with Tezos in the first place) will need to do lots of work to even get where Ethereum development has reached.