@Shimmy, 

HTML5 is a W3C standard so there is a pretty good chance that it will stick around for some time.

What are your thoughts on KnockOut?  Isn't KO the best technology to build cross-browswer apps in a short amount of time?

BTW:  I agree with you about LightSwitch being limited.  However, it does a very good job of building RAD forms biz apps.  V2 is in beta and I'm looking forward to an improved Extensibility Toolkit before V2 RTM.