Hopefully it comes to an end! History tells me that I upgrade not for performance reasons, but for certain features...such as portability or a Retina display. I've had: 2009 13" MacBook, 2011 11" Air, 2013 13" Retina Pro, and now full circle with a 2015 12" Retina MacBook. I never had the 12" PowerBook, but I always admired it...so this new MacBook must be a dream come true for former users of that. I'd really like to have some consistency in my Mac models. I can't see a new feature coming out that makes me convert back to the Pro, but I said the same thing when I got the Air. Retina display in a super portable laptop was what I was really waiting for. I've also never really been an adopter of a first-generation product before. So I'm excited to use the rMB as it grows, much like the Air did between 2008 and 2011.