I'm sure this is WT's idea of providing proof there's no demand for the DFW-ICN service, and that if you can't joint ticket on KE, it's doomed... never mind the fact that Korea is the size of Arkansas, and most of the demand is to Seoul...
What's the source of this so-called crisis?
There's certainly nothing technical which prevents KE and AA from doing a joint booking. Amadeus has a full content agreement with both KE and AA, so even if they had to issue separate tickets, a joint booking is certainly possible.
And before anyone starts hand-wringing over split tickets... it's a routine thing due to fare rules. I'm on an all AA booking this week --- even that's on split tickets, because if I combined the international and domestic, the fare rules dictate that the most restrictive rules apply, so, I'd wind up with a non-refundable ticket on the international, instead of a fully refundable/changeable ticket.