Well a few thoughts...
Most people still don't know anything about 3d tours but EVERYONE knows about video. So it's not really a fair comparison at the moment.
Video is still vital for a lot of things, not the least of which is SEO ranking. Google values video very highly. This is how I sell video to some people. When they're not sure if they should do it as well as the iGuide, I explain that to them and, more often than not, they'll go with the video as well.
At the end of the day, from our perspective (as the people providing the services), it doesn't really matter what the buyers want (in the short-term) as they aren't the ones ordering our services. If realtors buy iGuides/videos/etc from me, I'm happy. Now, in the long-term, if the buyers are actually asking for certain things, then yeah, it matters. But that seems to happen rarely--the buyer asking for a specific service.