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What? A Sony fanboy begging for a 360 port of one of the most important PS3 titles?
I don't really see any need for that at the moment. PS3 is doing better than X360 (although its userbase is still smaller) and probably better than Konami expected last year. MGS4 is getting hyped very much, it has also recieved a few great reviews (major sites are still missing though) and its pre-orders probably exceed one million worldwide.
Also, a port could be a difficult thing to do. 50 GB isn't something that's easy to fit on a DVD9, even with the sounds compressed. It would be two discs at least, and I believe it would be more. And I believe making the port wouldn't be cheap either since I believe it's been well optimized for PS3. I'm sure there are some very interested X360 users though so it might actually sell well, unlike MGS2.
However, my main point is that while they would make money, they only need to make enough money, whatever that means. Kojima doesn't seem to want it on X360 and I believe his opinion will be respected unless the game fails which I highly doubt (although it depends on Konami's objectives with this game). Even if MGS4 was to be released on X360, it couldn't possibly be a better version. It would probably be somehow cut version. Not equally good (but still good, probably).
And no, we don't want some GeoW on PS3. We want Uncharted multiplayer. Mass Effect might be good but we're getting FFXIII, which is probably going to be better.
