Avalon is a Luxury item
Let's face it.
Everyone needs WinFS. Searching for data in Windows is a pain.
Most developers need Indigo. The ASMX/EnterpriseServices/Remoting thing is too confusing and selecting one is hard, and we need better tools to move distributed computing forward.
We really don't need Avalon. I love it, but we can live with our gray Windows Forms. Avalon is like driving a Ferrari. It's quite high in the 'computing Maslow pyramid'.
Avalon is a luxury item. In some countries you'll need to pay more taxes for using it ;).
Update: I probably mean Aero and not Avalon. I'm referring to the supercool-looking UI.