Nintendo offers Wii Sports Resort bundle with two MotionPlus accessories

So... It's not selling well enough? No surprise, considering that there aren't a whole lot of games that will use it yet. If Nintendo wants more people to bite, they need to encourage the software companies to use it.

In the past, companies have offered licensing\ royalty breaks to lower costs for development early on. It gets development teams more comfortable with the added hardware, they usually come up with other ideas inadvertently, and customers begin to expect more games to use the hardware\perepheral. This means that the companies are now likely to continue using the new gadget\addon, and the console's manufacturer (Nintendo\Sony\M$\whoever in specific cases) can better say "Look at this awesome thing you can do with our system! Look at how many games are that much cooler with it!"

This is how the rumble pack for the N64 took off, this is how the gameboy color got it's software library, and this is likely what M$ and Sony will be doing with their new motion devices as well.

If the big N wants this new addon to become prominent (Which in turn would reduce complaints about accuracy, or the lack thereof), they would be wise to offer incentives to software companies for utilizing the new motionplus system. It'll help Nintendo sell more bundles, and it'll boost the overall 'perceived system morale' to keep people interested.