When to Change Your Opening Repertoire

Ah, I see some Gothamchess infused article here! Getting a great position from the opening, then spending all your time on three moves in the middlegame, blunder away the endgame - it's the opening's fault!

I actually think you forgot one reason: You used your new opening once in a tournament, and now it's "gone" because every opponent you will ever play saw it and instantly prepares against it perfectly.