Some valid points in the bootnote
But, dont forget that the Xbox 360 is the only console right now with no motion capture built in. The Wii obviously does the whole Wii thing - and the PS3 has SIXAXIS (whether you think its good or not is neither here nor there).
So, to say that developers wont waste the time with a new fancy control system is a bit off. PES on the Wii for instance, is an example of a studio adding a new control system to a cross format game. In fact, all the games on the Wii that are available on different platforms are an example of developers choosing to do this.
The second point is the most interesting - could there ever be an agreed standard for console controllers? I am not sure there could - and why should there be? Manufacturers like Sony, MS and Nintendo only really care about their own hardware, why should they agree to make their controllers interoperable if they can be sure of dominance? Lets face it, right now, the PS3 and 360 rule the roost in the 'hardcore' sector, with the Wii owning the casual market. Both MS and Sony appear to want in to the casual market, and so will want to make as much money as possible there. So they wont want there platform to be compatible with someone elses, will they?