I worked at a company long enough to go from young dev who wants to use shiny new tech (and is told no by party pooper experienced devs); to the party pooper experienced dev for a new group of young devs.

I know I'm right, as I'm now sure the devs telling me no were right, but I'll be pushed out same as they were.

Young blood is naive and cheap and plentiful so they will always have the momentum advantage. They're the ones that promise the moon to other departments and then stay up all night covering their tracks when they were wrong.