I'd rather have things the other way, because of where my case is. That way I would be able to have a window if I wished, that I could see into. (True for both my PC's).
It doesn't seem to bad, I don't know why people are complaining.
In the end oyu go for a new PSU/mobo/case anyway.
Plus there are socket changes happening, like 775/939 and PCI-Express.
Introducing something else new at a tim ewhen most other things are changing seems to make sense and cause less hassle.
BTX, 939/775, PCI-Express, SATA
All need new parts, all will be here in the next ~6 months (assuming people get their BTX designs out of the door).
Plus, getting everything into an ATX case is pretty hard, my case isn't small and it's a mess with wires going everywhere (which is necessary, there's no other way to do it) - BTX looks like it has the potential to be "cleanrer" especially with power leads (ie: 20 pin main connector).