If you look at sales, advertising, development or any form of investment it wouldn't be fair to call Vita anywhere near half of their gaming division.  Sony ignores that "half" of their gaming division outside of Japan too.  

Glad none of you are running these companies

I'd say the mobile division has some hope too. Something along the lines of the Xperia Play, but executed correctly (i.e., give the thing access to both the PlayStore and the PlayStation Store)

Who would you recommend for CEO? Bear in mind that Howard "The Fixer" Stringer's stint at the helm destroyed his cool nickname, and Kaz's popularity is bordering on satire, so who is a bad enough Dude to rescue The Company?

Firing Iwata would solve everything.

Your statement would make more sense if Sony/their playstation division was spending equal resources to vita. They aren't. There's no way you can argue that the vita is the other half. It's more like a 12th, if not less.

Howmuch money have they spent on ps4 advertising compared to advertising for psvita? How many games have their studios made and how many timed exclusives have they paid for? Your comparison with Ninty is invalid. Ninty's strength is a handheld and we know that handhelds are not popular any more and their popularity will most likely fall even even further in the next generation. The ps4 hasn't reached it's peak yet, while the 3ds has. Most importantly, Ninty is spending tons of money making games for wiiu, some of which have flopped, unlike Sony whose first party studios are spending close to zero resources on psvita projects.

They have let psvita die recently, so they are neither making nor losing money from it.

OK

What if

WHAT IF THEY SWAPPED JOBS

Would the shock of their new environments make them "hungry" enough to actually earn their keep?

SUPER EDIT: I want to see what Eiji Aonuma could do to The Last Guardian.

Again, the article explains this: Sony's current valuation is less than the sum of it's parts.
Splitting it up is instant paper profit for speculator investors like the guy quoted in the article,
who can sell his stake immediately for a profit, irrespective of what happens in any of the business units.
In the article, he refuses to make a counter-argument against the benefits of keeping the congolomerate together,
his entire premise hinges on benefits to stockholders in valuation terms, not on profitability or business operations.
Conversely, investors looking to earn actual profits out of Sony do better by Sony's below-spec valuation.

Never going to happen, the Japanese govenment won't let it

oh and to all the armchair CEO's and CFO's in this thread:

I'm not so sure a real breakup would be the answer.

Let's say the PlayStation branch was broken off on its own. 1 or 2 generations of bad performance could kill Playstation forever. Wheras if it were kept in the main company it could be sustained during bad times only to surge back when times are good. Case in point PS3 vs PS4. PS3 could easily have gone the way of the Dreamcast. Instead Sony was able to keep in the game and thus PS3 ended up not being the complete disaster it should have been, because Sony was able to stick it out and pump more money into the console and keep the games flowing. PS3 could easily have been the end of Playstation, thus we would not have the PS4. That would have been a tragedy given how shitty the Wii U and XONE are right now.

A very long view needs to be kept in mind if a breakup is going to happen. What should be kept, what should be spun off. Can a robust company be maintained if too much is spun off? Or will there only be just a bunch of mediocre has beens left.

Although, its funny that the most profitable part of Sony is the finance division...