Right away, I don't think LAN Chile will go to IAH. They have Oneworld partner, American, at DFW about 250 miles north on US-90(highway).
I can't speak for any other airlines. Let's be honest though, while IAH hasn't really grown for overseas carriers, they haven't really lost any. KLM,BA,AF, and LH have been there for a long time. DFW has BA,LH, and AF, but AF will stop DFW service this month. We have gotten SN, but they went out of business, and luftansa decreased frequency, so it is probably about equal.
DFW has done better in the Asian market though. KAL seems pretty comitted to DFW as they use it as a stopping point for an ATL flight, and instead of going through LAX, it now goes non-stop.
Anyway, I thought KAL and Alitalia were going to start IAH service, but i guess it never happened.
Give me a break, I created this username when I was a kid...