Nintendo has been feeling some pressure lately with the announcement of Sony's PSNow system which will allow gamers to buy a game once and play it on their PS3, PS4, or PS Vita.

This pressure is exacerbated by the fact that there are games like Super Mario Bros. 3 for sale on both the 3DS and Wii U eShops, but players must purchase them separately to be able to play them on both.

Miyamoto was questioned about this problem in a recent interview with Kotaku.

What I can say is, certainly, within Nintendo the fact that our development environment for our home console is different from the development environment for our portable system is certainly an area of stress or challenge for the development teams. So as we move forward, we're going to look at what we do to unify the development environments.

Shigeru Miyamoto

He makes it very clear that the biggest roadblock for cross-platform games is the different teams in charge of handheld and home console systems. His answer does not seem to indicate that there is any progress being made on this front, but hopefully Nintendo will begin looking down this road in the near future.