Forget another revision, we are due for a handheld successor.
What the hell? The 3DS is only three years old. The DS lasted for five years before the DSi half step and seven years before the 3DS.
It's a different market now and different times call for different measures. They don't need to release it this year, but announce it at E3, announce the launch date just after the new year and release it in March/April 2015. 3DS would have survived 4 years before being replaced. Some new handheld hardware that is more on the level of Vita, but with some improved Nintendo philosophy towards accounts, online and connectivity could be a really good step in building faith for the eventual announcement of the Wii U successor late next year.
Of course this is all based off "Nintnedo is showing new hardware at this E3" because personally, I think if they can hold off one more year, and then launch the 3DS successor early 2016 and the Wii U successor end of 2016, and they both compliment each other as if they were made to go together but also work perfectly fine separately, then that would be even better.
I suggest replacing an outright bomb in the Wii U and get all sorts of responses about how it's too soon and it would piss off the customerbase and yet the 3DS, the system that IS successful and has a sizable enough customerbase that pissing them off might actually matter, is due to be replaced after only three years? That's ridiculous.
It's too soon for the Wii U. Nintendo has to ride it out for atleast another year. 4 years and a replacement for Wii U will hit. End of 2016 puts them mid cycle to the PS4/XBO consoles. right when devs are looking for more power. It would be a good strategy of Nintendo to offset their schedule with the competition instead of everyone trying to coolest new kid on the block all at the same time.
It's the same line of thinking as the Wii U would have been amazing had it come out in 2011, unfortunately it came out in 2012, when much better things were following on it's heels. A 2 year headstart could have made all the difference with PS4/XBO on the horizon.