IMHO it's far too early to know. There's no real interest or momentum behind the platform at this time, and the only two companies that are showing a great deal of interest in it are Intel and Nokia.

Quality and consistency breeds confidence, and confidence brings on customers, and customers bring on commercial developers, which builds the brand and feeds the circle... At this early stage Meego has not much more to show for it but a terminal a bit of a route map so it would be a gamble. If the history of Nokia/Open Source/Maemo etc tell me anything, Meego could very well be a dead duck and in 2-3 years time you'll be asking the same question about the next operating system. But ofcourse no-one really knows, maybe that's half the excitement in taking that chance.

Personally, before investing much of my time/money etc etc I would wait and see how the brand develops and settles, developer APIs and resources become apparent and more mature, and see how it's going to be marketed and supported. All my opinion at this time, your mileage may vary.. good luck with whatever you decide anyway