I think your prediction fine and all that, but giving already market shares to each console and saying that those are very accurate is pretty non sense imo. I mean, they might seem logical as of now, but it could all change if something drastic happens:
Here some possible game changers:
X1 or WiiU make a drastic pricecut.
Some one releases ANYTHING that wins back the casuals that bought the Wii.
Xbone buys a HUGE developer/franchise/publisher, etc.
A 4th big player enters the market, with a more powerful console than PS4 (Google, Samsung, Apple)
PC becomes bigger and steals a big chunk of the traditional players from the console market.
I mean, there is so much that could happen, I think predictions are fine, but to say they will be accurate is waaay to early for that.