Eh... I'll be fine with this idea if it's done under at least one of two conditions:
The figurines are less than $20 each (seriously prime example of how the Australia tax screws us over)
Or maximize compatibility with games, so make figurines compatible with as many games as possible to the point where updates are done to games to make them work with figurines released later, if they really want to go the whole way figurines could even be made to work with Mario Kart 8 and Super Smash Bros. 4, essentially one figurine could be used with such games with normally large rosters including Mario Kart, Smash 4, Mario Party, Mario Golf, Mario Strikers, Mario every spinoff you get the idea.
Though it already seems like Nintendo's going with the second point already, the main thing I am concerned about is the price, we can already get extra characters in Mario Golf for $6 with two courses included, so I would expect the figurines to be decently cheap at least compared to Skylanders.