According to the actual share market, Sony's shares have actually gone up since the PS4 announcement: https://www.google.com/finance?q=NYSE:SNE

I'm afraid not. It did go up today and yesterday inexplicably but the reaction was very negative.
Let's see:
Feb 19: 14.65
Feb 20: 14.47 oops
Feb 21: keeps dropping to 14.08
Feb 22: 14.07
Feb 25: 13.79
Feb 26: 14.04
Feb 27: 14.34

At the beginning of feb things looked better with even 15.83 now it's 15.23 after a good day but the general direction is negative and at least very unethusuastic with the lame presentation.

For the uninformed the ps3 era brought the shares from above 50 to where they are now. But don't let facts bother you. Sony will do just fine with their best selling phones tv consoles and proprietary cards. Right. Moving on....

If you understood stock markets then you would understand that share price almost always goes down immediatley after a major product announcement. Fact is Sony's share price has recovered this year, and continues to do so.

I'm afraid not. You're the one who is obviously ignorant on the subject. I trade on stocks all the time. Next time I suggest you read the posts and stop talking nonsense.

The dude will argue with anyone over the color of the sky. Gotta admire his moxy?

Uh.. i'm going to buy Metal Gear Rising, Ni No Kuni.. and day one for the last of us. PS3 is actually my main console. Wii U is almost always shutted off. I finished super mario bross wii u (uff... it's getting way too long this title), i've finished zombi u.. sometimes i give a run to Nintendoland. I don't own the other multiplatform titles becouse i play them on pc, or i've already played them on ps3. All wii u multiplatform are old titles remake.
The Wii U titles i will buy are: The Wonderfull 101, Bayonetta 2 and, maybe, Lego City Undercover.

I stopped liking sony when the ps3 launched for £425, thinking everyone would rush out and buy it just because the ps2 was such a success.

If they dropped out from console manufacturing, I wouldn't lose any sleep thats for sure.

Many people DID rush out to buy it, at least here in the States. There were several news stories of people actually getting into physical fights in stores where there were only a few PS3's left.

But anyways, I would certainly hope that none of the three (Sony, nintendo, Microsoft) stop producing consoles any time soon. Competition is a good thing in my book, and they all have different exclusives and services that appeal to different audiences.