No. I'm pretty sure Nintendo will continue the 2-system strategy. The problem i see now is that Nintendo has for a very long time now had to stretch their overall resources thin by supporting two systems. This has resulted in gamedroughts at times.
I suspect the solution they're going to introduce 5 years from now is a unified operating system for both portable and home console, handheld hardware that use the same architecture to their home console hardware but still a vast difference in overall power.
What does it mean for games you ask? Imagine this: All future games releasing simultaneous on both handheld and console using a single developments studio, without having to spend extra development time. We'd have, as an example, Luigi's Mansion 2 released on both WiiU and 3DS this month.
There are tons other possibilities touched upon in other posts. I believe a system like that would be much easier to sell to 3rd party developers.
