What it is certain is that they will be better than the Wiimote. No company would be retarded enough to release a subpar product while they are trying to compete in such markets. It would be like thinking the next Firefox will be a downgrade compared to IE 8.
However I think the point here is about reaching audiences, right? It would come down to software mostly, I think. That would be another side of the coin. You can be clearly better on a technical way, but games come down mostly to subjective experience, so to speak.