No, making more languages is not a solution. If your language solves a problem that others cannot do as easily, great. The point is that even if you succeed on one level, you can create messes. One of the largest problems we have today in computer science is all the mess of poorly constructed languages. Just because something is widely used does not make it good, rather there are other realities like popularity contests, luck, press, etc. at work.

If you read my comment, you'd see that I didn't write no one should do it, just that there are only a few people that should. You can create your own language or DSL like thing in your spare time. Just don't spend thousands of hours on it and push it into the public. Without naming names, there are quite a few languages that we would be better off in many ways if they did not exist. Some of the authors of these languages have admitted as much and I am pretty sure they know better than both of us.

There's a difference between academic messing around vs. putting out something there with the presumption of knowledge. Making languages is a very hard thing. If you don't understand why this is true, you are probably one of these people that should not make a language. Sorry, but it does more harm than good 99% of the time. At best, the language gets ignored, at worst, it becomes popular enough in a half-baked state.