Eh... I feel like turning them into cards only expose how shallow the DLC attached to them actually is. They need a focused Skylanders/Disney Infinity like game where these things can shine. I still have absolutely no reason to be interested in them as is. I have no intrest in buying toys of anything.
If they made a free-to-play/cheap starting price game like that with iconic Nintendo characters where you unlock portions of the game with Amiibo, they could seriously make a killing. Then the uses in other games would feel like more of a bonus, and my cheap ass wouldn't feel bad about completely ignoring the toys and going straight for the far cheaper cards!
People keep suggesting it, but make it a MOBA. Make it hardcore yet kid accessable, like Smash. Turn it into a respected esport. These things would be in higher demand than they are now and, more importantly, it would get people buying Wii Us.







