I believe it will reach 5.5m by not much. Probably going to end up around 5480000-5525000. Which, let's be honnest, if you asked anyone 2-3months ago, no one would have thought that wiiU would have had 1-2 300k+ weeks when it was selling merely 20-30k a week.
Also, I do believe that we will see a much higher baseline in 2014. Probably around 50-70k until the heavy hitters are released which would be a huge improvement over the baseline of 30k in 2013.
Predictions for LT console sales:
PS4: 120M
XB1: 70M
WiiU: 14M
3DS: 60M
Vita: 13M