On what are you basing DISH is becoming less interested in OTA? Quite the opposite. Both versions of the HOPPER have it with a newly developed Dongle for them, VIP receivers have it built in or for some you can add the module and all can scan all channels available. If they used PSIP it would be better, but DISH never has so that's not losing interest. If any company is going to do what it can to make sure people can have OTA it will be DISH, as a backup to the affiliates opting to pull their service over money demands.
Pure speculation, but I'm just waiting for DISH to use or buy out Aereo offering the separate antennas for their customers.