I don't know about that....
Can you imagine how much tech support Tivo would have to have to support the average user? MS has realized this and they don't' support anything with WMCE unless you buy it installed on a media center PC...
Also, I can't imagine that it would be as great as Sage is now... I vaguely remember a great piece of software called Meedio... Not sure what ever happened to that... 
Flips
Your source for everything home theater & HTPC related

I would like to see something more like beyond tv link.
Would allow you to use the tivo from your computer, while it is in use on your tv.
BTV Link allows you to watch all of your pre-recorded shows as well as live tv, with no special hardware in your machine.
Would be much much easier to support, as long as people had realistic expectations for performance on wireless networks.