You asked about the market demand.
Since silverlight is an ms product, it's supported by all the web applications built by MS products like ASP.NET, sharepoint etc. Silverlight without asp.net or sharepoint or anyother web technology knowledge is not a good thing.
Silverlight will be an added plug-in, it has the market value of a usual plug-ins.
The main drawback for silverlight is "we need to install the software to enable it even in the client side" but I prefer JQuery than silverlight since it has all the features of silverlight and no need for any installations.
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With regards
Nishithraj Narayanan
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