Wools
Intrigued by your theory that this is an airport problem...
The kit is provided by the GHA for their airline customers. So in your view, the airport states "GHA - you will provide X number of rigs". The GHA now has to say "Airline, you must pay for X rigs because the airport has mandated it!" I can see how that conversation ends.
Airlines need the service but as with everything in life do not want to pay any more than they have to for it. Of course the trouble with de-icing is everyone wants the service at the same time. Rather inconvenient really - if only some of these airline would agree to de-ice in July we wouldn't have these problems every winter!! :-)
So as much as it is a problem that the airport has to manage, as the airlines will have to pay for it, I can't see any huge changes unless we see some mind set changes.