The problem is that pilots *have* stopped the "land and hold short" practice in some cases.
What this is, and is used on commuter planes sometimes, is the pilot is told it can land on runway xx and is requested to stop short of the intersecting runway, so that a simultaneous operation can be performed on the intersecting runway. This is no problem for prop commuter planes, but with jet commuter planes (ERJ's and CRJ's for example), the pilots are refusing the "land and stop short" requests because they need more runway to land and don't feel safe accepting those requests.
Note it is up to the pilot to accept or refuse these "land and stop short" requests.
I'm not sure what they're negotiating exactly ... trying to change the pilots minds all of a sudden that it is safe when they don't think it is ...
Of course the labor problems with UAL will help this situation if they keep cancelling flights