Definitely seconded. For simple geometry like the flat plane of a building facade, this should work nicely.
I imagine the difficulty is that comparing user-shot synths as input to professionally captured Bing Maps Streetside panoramas, our synths are very much unstructured, compared to the professionally shot panos.
Bear in mind that Vexcel spends their time tweaking Bing Maps' photogrammetry projects until they're just right, whereas if this were introduced to Photosynth as a feature, it would need to work largely automatically, with reliability equal to (or ideally better than) ICE. As an aside, Photosynth team, although I recognise that automation is an important factor for user adoption, some interaction with the automated stitch would be very welcome. This goes for correcting photosynths and ICE panoramic stitches, geotagging subsynths individually, etc. etc.