[dguaraglia]

As someone who's been in a similar situation - being paid to support software that had two minor issues in two long years - I'd say: leave.

You are absolutely right about your career stagnating. Unless you are working on some kick-ass side-project that is making a difference (whether as extra revenue or a useful piece of open source software), you'll probably grow bored and restless. The longer you stay in that state, the longer it'll take you to go back to being functional in a day-to-day team environment. It's not fun.

And always keep in mind: you don't need to make the jump in a vacuum. Use your current situation to your advantage: take your time to find the perfect company for you, with similar compensation and challenging work that'll keep you engage. You won't regret it.