I think its safe to say that Halo did make the XBOX a cult gaming choice at the time, it had a reason to be on the market, but the 360 would not of failed without Halo 3, in effect the 360 was initally successful on the carried weight of the XBOX and Halo 1 & 2 fans, so it helped the 360 certainly, but Bungie wont be helping the next XBOX, although the HALO IP might.

But isnt this the situation for all consoles? Good games equal good console sales?

XBOX has Halo just like the PS1 had Final Fantasy to thank.

Its a little big headed of the Dev to think they Made MS gaming choice easier! the fact the game was good Dev should get thanks for, thats about it, but it will be interesting to see where Bungie ends up, i suspect without Halo they will struggle to be noticed as much.

Explain the PSP sales then? Which aren't really bad, actually quite good, just not compared to the DS, but no one buys games on it that aren't called Monster Hunter...and it sold already quite good before Monster Huner came on it.

First of all nowhere in the interview did he say "We Carried Xbox 360" that's just a nice controversial headline you chose to get plenty of fanboy traffic, "...had no idea it would... single-handedly make or break Microsoft’s entry into the game console market." refers to the original Xbox which certainly got a boost from Halo 1+2.
As for Halo 3, you could just as easy say that Bungie needed the 360 as it would never have made a profit off of the user base that the PS3 had at that time, good games require a console with a good market share to make money and consoles need good games to get their market share, the 360 had a strong user base before Halo 3 launched, yes it moved more consoles but they couldn't of made the kind of money they did without the 360.
To be honest all Bungie have done is a bit of self-promoting which you would expect a company to do, it's you who have changed the emphasis of their word to get youself some of that fanboy flame war traffic.

Piracy as with the DS and any other handheld console previous that was dominated by nintendo. at least thats my opinion, the fatc the PSP costs nothing to hack and the DS requires a one time buy of a Cart that costs less than half the price of a DS game.

where as compare that to the 360 and PS3 and Wii

you first have the complication of soldering a chip to a board, special Readers and Writers to Rip and Burn respectively and not to mention Media for 360 and PS3 doesnt come cheap, its why its not so popular as it is in the Handheld market.

as for Monster Hunter well thats those Crazy Japanese for you, personally i thought Monster Hunter was pants, Lego Batman is my fav PSP game at present and Lumines being my all time fav, as Soon as Sqeenix Annouce a PSP FF7 Remake then that will be im sure.

but htere hasnt been any fanboy flame war traffic? and if the title is trying to attract fanboys what kind of fanboys that love halo 3 or the MS would come to slag off Bungie or the 360? even PS3 fanboys would have nothing to add other than maybe "yeah the 360 would fail with out Halo" to which a 360 fanboy could reply "yeah the PS3 has no games" and so on...

I also read the interview, and i got that they implied to carried MS into the Games market which includes XBOX and XBOX360.