I thought about that, Mario Lego game or even better Zelda Lego game could be really great. Nintendo really need to make deal with Warner Bros. Interactive for exclusive Lego games based on Nintendo IP. And I think that Nintendo on Switch will have more 3rd/2nd party exclusive deals than before, so maybe we could have something like that.

SURPRISE!

I was doing a thing like what they did with Shin Megami Tensei X Fire Emblem. XD

Aren't they all identical games with a different paint job? I think there's already too many of them.

It's going to happen, eventually. Just like Nintendo vs Capcom.

You could do things with them. It's more the humour and presentation than the actual gameplay, although it can work pretty well with some ideas, like building your own maps with legos on a 3D Mario.

Now I want a Lego Luigi's Mansion or at least Lego Star Fox.

Why would Nintendo want to do that? I highly doubt that any franchise would sell more as a Lego version and even if it did Nintendo would have to split the profits with another developer.

Considering the only thing Nintendo would need to do is allow Lego a good deal with the Lego toys, it would be fine. Most Nintendo games sell respectably well, and Lego games have kept a decent standar of quality. Plus, I feel this would focus more to get better support from TT and Warner Bros than to sell the game.