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IS MVVM getting any kind of traction outside the Microsoft community? Within Silverlight this is a non-issue, but for other technologies, like JavaScript it surely is: For instance Knockout.js is a great framework, but the 'rest of the world' seems to be on a Backbone path.
My concern is that MVVM frameworks (like Knockout) are going to suffer a lack of network effect by being constrained to the Microsoft ecosystem, and thus fall behind compared to the rest.
MVVM outside of the Microsoft is known by another name. Presentation Model. This appears to be gaining traction especially in the Flex world. I'm still learning the ropes but it seems to be gaining traction.
Various Flex examples I have found recently are:
One question that continues to bug me is when do you need a dedicated Controller in MVVM / Presentation Model. Some examples have dedicated controllers (e.g., Cafe Townsend) and others do not (e.g., Score Keeper). However, I think this is a question for another post.
Based on the Wikipedia article, there are a dozen+ implementations of the MVVM framework. Given that Mono is out there as well, I'm not sure I'd use the word "constrained". So, no I don't think they'll be constrained as such. However, as pointed out in the same article, MVVM isn't always the best design choice.
