microsoft is a realist
let's face it -- you can say what you will but Microsoft is and always has been realistic. What they couldn't accomplish in Silverlight 1 they are targeting for Silverlight 2. It might take a while.
Another two releases for complete parity?
And they can't do this forever -- with MS's revenues -- at this rate, if they don't get it in the next, say, 75 years, they might have to give up.