3D and Crab,
The radar is only an issue to the customer, not the manufacturers, since Sikorsky has installed only about 600 of them, and the technical leap is not an impressive one to do it on a 92 sized machine, especially one with a flat belly and retractable gear.
The issue is one of how requirements are let, and how economics and mission effectiveness is a part of the process. I contend that this might (like OEI hover and perhaps 100 other things) be a case of where the requirer has no skin in the cost game, so that hard requirements are set based on the 99th %ile mission and not where it is economically driven. That being said, the customer sets the equipment and the mfgr responds!