No, Rails hasn't turned into Java. Rails has matured into a complex ecosystem. Java has also matured into a complex ecosystem.
Frameworks upon frameworks is a recipe for complexity, potential performance problems, bottlenecks, and environmental/context-specific issues regardless of the language that you're using.
Will there ever be a language or simple framework that is popular, solves all problems, and doesn't get more complex as its ecosystem matures? I won't bet on it, but if you figure it out, someone will still eventually compare you to a no-longer-hipster-cool framework as an insult.