Just realize that if MS and Sony make a motion sensing controller any games that use that feature will require that controller, and those won't be a simple cheap add-on. For those gamers it'll be a $40-$50+ investment Per Controller and no possible backwards compatibility. At least for us Wii gamers chances are this simply reports more accurate information to the Wii, so it'll be backwards compatible with older games (making it more useful than a motion sensing controller for the 360) and new games, while better and more accurate with the add-on (or new remote) will still function and be playable with the older hardware. Play Station owners don't get the rumble controller for free, 360 owners won't get the motion sensing controller for free, PS1 owners didn't get Dual Shock controllers for free. There's nothing new here - Nintendo doesn't "owe" us anything with this. Be glad they aren't just making Wii Remote v2 and you have to spend your 4x$40 for totally new remotes.
I think, given the industry precedent that Nintendo is doing it right by the consumer in doing it this way.
I somehow doubt that this was intended from the beginning by Nintendo in order to leach more money out of the first two years worth of Wii owners.
They won't be able to afford to give this for free like the replacement straps and the jacket, but given the track record of Nintendo with this stuff for the Wii I don't expect it to be too expensive.
-silver lining-