Honestly, I'd be much more worried with where my life was heading if I planned on using MDMA indefinitely than I am with the frequency in which I use it now. No I'm not saying that it's better to burn yourself out in a couple of years then move on, but it's definitely a big concern (IMO) if you'd rather the idea of taking it on the odd occasion indefinitely.
Going by how I feel (given we all know our own bodies best), I don't in anyway see a problem with my current use - especially given I have no intentions on keeping it up for very long at all. The only times a roll hasn't met my expectations have boiled down to either set, setting, or whenever I've taken a pill (as opposed to capped crystal of known quality and quantity). Should I ever have a diminished experience as a result of rolling too often, I'll take a very extended break....but until then, IME, my healthy lifestyle and general mindset/attitude appears to adequately compensate for the occasions on which I take MDMA.