The challenge of course is that programming the video is dependent on getting support from Broadcom. One thing that has really pissed me off at them is I've got an InPulse watch that I can't get 64 bit Broadcom drivers for Win7 to use their SDK, how sucky is that? So getting support for their video blob in the RpI is probably not going to fly either.
Having HDMI means any kid can plug it straight into the family television without any problems, or they can always get a new, cheap monitor for well under $100 if they shop around.
It also doesn't preclude the Pi from being used to drive large displays for commercial applications or for classroom presentations.
I see plenty that do: http://www.ebay.com/sch/Monitors-Projectors-Accs-/162497/i.h...