Yeah, do what MXQuadRacer said. Kid if you maintain your engine like you're supposed to, you should be Ok unless something freak happens. So far that I know of these engines are very reliable, but that doesn't mean get lazy in terms of servicing , but at the same time that doesn't mean you are constantly working on your hotwheels. Maintenance is part of high-performance no matter what machine you ride and that even includes Hondas! Your engine may not last forever but keeping up on it or serviceing it when you should will help you get the most out of your ride.
I think that everyone you know is ignorant (IGNORANT-meaning: lack of knowledge) and doesn't understand these newer 'Thumpers' leading them to think they are ticking timebombs. It also depends how hard you run your machine too. So there are some variables to the longevity like is it stock, does it have bolts ons, is it full blown race prepped etc. along with how much you ride it, conditions: is it muddy, dusty or perfect?, how hard you push it (casually riding or is it pinned like racing?) and how often you maintain and/or service it. I know before just about every ride I put a fresh/clean airfilter on (pending how bad it was from the previous ride and what it's like outside that day) and check oil everytime.
Sorry for the speech, but I hope this helps you understand some of the variables to your engines life. AND if you have anymore questions the guys/girls on this forum will help if and when they can if you have not noticed.
Knowing = understanding which leads to having knowledge.
Thats how I understand it all....