Right, you just have to keep in mind what features or improvements will make you upgrade and wait for 'em, not just jumping willy nilly at every new body (or lens). When I first went looking for a 'good' camera again (after decades of nothing more than a point and shoot), I bought the epl1 because of the price and not really knowing what I liked and didn't like. Turns out I loved 90% of the camera but HATED the push-button interface. I bought an ep2 a few months later and LOVED it and sold the ep1 not long after. I don't see any reason to "upgrade" the ep2 at this point, even though the epl2 may have a few slight improvements. What its gonna take to get me to upgrade are features that may be part of an ep3 or may be part of an ep4 or ep5 or a gf3 or 4 or 5. They'll happen eventually and I'll upgrade, but until then, I like the ep2 just fine.
If you DON'T like what you have (in ways that other cameras would solve), that's reason to look around at new stuff. If you DO like what you've got, stick with it until there's a really compelling reason to upgrade and don't be tempted to jump at every little 'improvement'. Now I'm in the position of sort of watching a race between Nex and m43. I suspect I'll keep both, but if m43 nails the body features I want before Nex gets some really good glass out there and probably upgrades the body, I'll probably stick with m43 almost exclusively. If they don't and Nex gets a few lenses out there, I'll probably maintain a combined system. I don't ever see using Nex for long lenses - they'd just have to be too damn big. And even though I do see an improvement in IQ with Nex, its not important to me and I'd be happy to go back to m43 if they ever nail the rear screen in a pen-style body with gh2 speed auto-focus. Man, that Nex rear screen is a frickin' revelation! I was out yesterday in the brightest sun with tons of glare from snow and reflections and I could see it PERFECTLY, in addition to positioning exactly how I like. It was fine in "auto" screen illumination mode, and then I tried the "sunny day" setting and my LORD, it was as clear and visible as any screen I've ever seen anywhere, in any lighting conditions. Just incredible. Absolutely no need for an EVF with this screen. Give me one of those on a good m43 body and the ballgame is over...
-Ray