If they added that and make games that require that feature, wouldn't that just screw over people who have the older ones?
If they do add multi touch and make games that don't require that, then it's kinda wasted. Some people may have a slight disadvantage over those who do. (C-Nub on NEW 3DS in Smash for example)
Not against it, but it has to be really worth while.
My Wii Remote started to endlessly flash in this pattern where the fourth bulb will flash and shift back to the first bulb. I've tried syncing it, changing/taking out the batteries, and resetting the console but all have had no effect... so don't know about those remotes...