Because it is sad for a Console to hit it peak's sales in just 2 years and after that decline, the Decline on USA wasn't so big but on UK 16% is a lot, and i think that the Xbox One is doing even worse on Europe and other countries, the console already is more than 60-70$ down YOY on Japan.

It will be the longest generation ever. With the PS4 Neo 2 and PS4 Neo 3 prolonging it for another 5 years alone. The generation will be exactly as long as people start realizing that the current arbitrary rules of what constitutes a new generation and what not are silly at best.

Yes, 'versions' not 'cycles'.

If gta 6 comes out in 2018 that could be the peak year.  That game alone will probably end up selling 30m on ps4. 

looks like last gen is really dead now.

yay for ps4 but i'd like to see that number be a bit higher.

We could do a John Lucas, he claimed that his predicion on the PS3 and 360 "dying" were correct since the Slim versions came out...

I'm not so sure that we'll see more than one main update (as in a proper hardware upgrade, not just shrunken die and slim versions) and then a new console. They won't lock themselves down to one design paradigm over a decade or more with the speed with which the tech industry is moving now, ending up having a box that has nothing to do with the original PS4, that is still named PS4 makes no sense from a marketing perspective or design perspective. I'm really not sold on the idea, but I have said all along that consoles will rely more on revisions and added features since the smart devices are setting the pace and consoles have placed themselves in the line of fire by offering competing or semi-competitive features and options.
Heck, we don't know anything about the PS4 revision, or the possible Xbox revision, they could be slim consoles with some added features (like 4k movie output and more streamlined VR-friendly setup).
Expecting consoles to stay on for several cycles with only small changes, like mobile phones, is a bit unreasonable since consoles are a much more static product than smart devices, this is also evident in the numerous revisions the 3DS got compared to the home consoles of the 7th gen, for example, as the 3DS competed/competes a lot more closely with tablets and phones.

I still maintain the belief that the 8th gen will be shorter than the 7th gen by a fair margin and that it will die off a lot more abruptly and quickly once new hardware is in place, once more due to the savage pace the industry has to keep up with, and thus also the consumers and overall market.

Shame. I'd love to see a 99€ PS3, even if it's just to see the price of used consoles go down.

Not a surprise.

Clealy these UK sales have failed to meet Sony's expectation (I see like some guy on gaf say how Sony are disappointed so must be true because it's gaf. Nuf said!). Sony's UK adverising team increased by 2 people and I saw like 3 ads for PS4 this past week (usually I see 2 a week) so it must be there biggest promotional push EVER!

So disappointing for Sony!

Wii U drop is huge, but expected given the lineup. XB1 drop isn't all that surprising for the same reason. Not to say that Sony has blown any doors off with their offerings, but at least there is some consistency in an exclusive release schedule through the year there.