I kind of agree with that as it goes for most people. You're buying into a system where cameras come and go. That often means one manufacturer has an advantage for a while then it swaps to another and back again. OK thats not so true with mirrorless at the moment as Sony have been doing it for long than the others hence they are currently further along. All of the others will eventually catch up and there will be less of a gap. It then becomes a flip back and forth trying to get that slightly better performance. There is a reason why manufacturers employ pro's as 'ambassadors', its just to get us to believe we need to buy something else as our current kit is utterly useless (the same kit they were wax lyrical about a year or so early). The worst thing you can ever do is follow pro's where they talk about kit more than anything else or read review after review.
@rookies only you can say whether its truly worth it for yourself. No one else can tell you whether it is or not. I know how hard it is to make the swap, I'm still doing it a year later! (I've still got nikon bits hanging around unused). Making a swap isn't always the best route as there are always disadvantages to everything. It usually means either a big cost difference swapping like for like, or downgrading to lower quality kit with lower performance.
So far moving to Sony seems to have worked ok for me because my biggest driver was downgrading to lower weight kit. From that point its working as I'm more likely to walk further taking a risk on the off chance of something may work out (often it doesn't). I am missing the extra stop of aperture having dropped to f5.6 wildlife lens but generally most of my wildlife isn't that taxing on camera systems. You probably wouldn't be able to see the difference in images. I do miss the weather protection of nikon but then I've always used rain covers so its less of a risk really.
