Sony sales numbers are certainly questionable. Sites like www.vgchartz.com suggest Sony has shifted 14mill units, nexgenwars claims 10mill.
At E3 last week Sony in their very own keynote announced "We're close to selling over 10 million units". This is irrefutable evidence that the stats provided by most sites are wrong, simply because it came from the mouth of Sony themselves.
There's no doubt that MGS4 increased sales, but the increase is still rather modest and does not come close to the sales increases bought by the likes of Halo 3 and Super Mario Galaxies for their respective systems.
With Final Fantasy IV now due to be released on the XBox 360 despite Sony owning over 17% share in Square Enix and Sony's talk of focussing on the longer term profits it's fairly clear what their strategy is.
Sony accepts that they can no longer compete in the market of latest and greatest in this round and are hoping that over time when Microsoft and Nintendo have moved on to next-gen that they can at very least do as they've done with the PS2 and satisfy the last-gen market, people who are happy with older, less impressive but much cheaper hardware. Whether this will work is interesting because over time if the PS3 can't at least get enough sales to drop it's hardware costs it could get overrun by the decreasing price of the Wii and 360 due to their high sales.
To suggest US PS3 sales surge is a bit enthusiastic, "One or two months of good sales due to MGS4" is more realistic. Sony themselves accept they've screwed the pooch this round with their acceptance of FFXIII on the 360 as major Square Enix shareholders, they know they're going to make more money this way. It comes as no surprise though that The Register puts an overly positive pro-Sony twist on all this as they didn't even cover hardly any of the extremely positive news from Microsoft and Nintendo from E3 yet gave plenty of coverage to Sony's mediocre, almost irrelevant news. The Register, like Sony fanboys simply can't accept the facts this time round. Facts, that even Sony themselves now accept.