I think the idea that this exploit should be delayed until after Halo 2 is well founded, particularly in light of the Star Wars disc incident. It's one thing for MS to update the dash via your online service whenever you try to log on to Xbox Live, but if they were to place an executable on the disc that automatically launches whenever you try to run the game and upgrades your dashboard to a non-exploitable version it would be quite a problem. The former scenario allows us to play Halo 2 in some fashion and retain our exploits, the latter doesn't. If they wanted to they could kill all the exploits available now with their most anticipated release on Nov 9. Shouldn't we keep something underneath our sleeves until then?
Of course, this assumes that this exploit is different enough from those available thus far that this actually makes a difference. I don't know that.
And BTW, though MS may recognize that exploiters are the smallest group in the Xbox mod-scene community, they probably recognize that they're the easiest to get rid of and patch up. I wouldn't put anything past them.