Console gamers buy a console mainly because they have games that's they interest them if they don't like a numbers of games they would not buy a console even if you offer them a lot of multimedia functionnality,if multimedia functionnality so why ps4 is outselling x1 and why ds and 3ds some more then psp and vita.

People buy consoles because they have a lot games that they interest them and use multimedia functionnality because they already have a console and people buy a smartphone because it can talk with it and buy games because they already have a smartphones.

I agree completly that the power situation will never be overcome anytime soon. BUT, you are speaking to the 20-20% of gamers that actually need that kind of gaming experience.  With the cost of AAA content being so high, if a large portion of the console buying public figures out they don't need a console to play the short mobile games, the publishers won't continue to make them for the console crowd.  If you look at the gaming that is coming down the line for mobile devices, it matches with what most of the casual gamers are looking for.  The games will not be AAA console/PC games, but they will be "good enough".  That is what will kill console gaming, "good enough".  Already, we are seeing that most of the next gen games could be played on last gen, but the visuals/framerates would suffer dramatically.  So, if the developers recognize that there are a billion smartphones out there that have powerful enough systems to handle games(2-4 years from now), they will slowly quit the console markets - thus further reducing the need for a console.  

No guarantees to this idea, just a thought of where it is going.  Someday!

But, if the smartphone that they HAVE to buy to talk on anyway can play games similar enough to consoles, why do they need to buy consoles?  

The PS4 is outselling the XB1 for almost a whole year now.  It isn't just because of the games that are on it now, it's because of the games that are coming too.  If M$ hadn't screwed their announcement up and hadn't released a console priced $100 more than the competition, they wouldn't be being beat down so bad.  Would they be at PS4 levels?  No, but if they had sold 3 million more and the PS4 3 million less, it would have been a lot less to talk about.  With the power gap, the PS4 was destined to have a lead in sales to the core buyers.  But, when you combine all the PR and pricing problems and the power too, even the casuals are easily swayed to go PS4.

Point being, if people realized that their smartphone could really produce impressive games that lasted more than 10-15 minutes, they might see it as a console replacement some day.

Actually Tegra K1 according to nvidia, peaks at 365 GFLOPS (@950MHz).

Isn't Destinay playable on both the 360 and PS3?

Another Iphone launch and another prognostication of the DOOM of console gaming!

As most of us know, the Iphone 6 was announced yesterday.  Earlier this year, Apple also announced Metal http://www.polygon.com/2014/6/2/5773128/metal-ios-gaming-wwdc  their "almost direct access" utilities for developers.  It's interesting to note that Apple designs their own proprietary processors, as that means they also design them with their own OS in mind.

THe new processor in the Iphone 6 http://www.extremetech.com/computing/189787-apples-a8-soc-analyzed-the-iphone-6-chip-is-a-2-billion-transistor-20nm-monster has over 2 BILLION transistors.  THat is a crapload for a phone.

During the keynote, Apple demoed VainGlory http://www.ign.com/articles/2014/09/09/vainglory-the-ios-moba-league-of-legends-and-dota-2-players-may-care-about .  It was pretty impressive for a cell phone game.  The thing to remember about this game, is that it wasn't designed to work only on the new Iphone 6, but previous Iphones too.  So, this game is only scratching at the surface of what will be available in the future when developers aren't afraid to make games for "only Iphone 6 or later" type of scenarios.

If I was making portable gaming systems, I would have been worried 2 years ago that cellphones will eventually wipe out my business.  As of today, I would no longer be worried, I would be accepting my fate.

You can take your cellphone and hook it up to just about any HDTV and get the same output (1080p in most cases) as you do on your cellphone screen.  Yu can also add controllers to get past the screen mashing of the cell phones.  I would guess that at some point, they will sell a Docking Station for cell phones. This will be a simple thing that provides continious power to the phone and a direct hook up to both the tv and wireless controllers. That would basically eliminate the need for console for 75% of the market.

As far as Console makers go, I am sure that they have a few years to go before they hit the panic button.  But, based on how hard Nintendo/Sony/Microsoft want you to get in their ecosystem now, they know what is coming.