If you can get past the polarization of this issue, it's really an easily solved debate.
There are all kinds of fans that love sports, blind ones, deaf ones, fat kids, skinny kids, even kids with chicken pox.
It is in the Washington Commanders and every other sports orginization's best interests to somewhat cater to this diverse society as it can effect bottom lines, and more importantly, image.
In this technological advanced age, a jumbo tron or monitor is not necessary to inform deaf fans of current happenings. I'm sure a cell phone service would jump at the chance at becoming the 'Official NFL Cellular Supplier' by making available cell phones that would do the tracking via IM or text messaging.
NASCAR does this sort of thing with the in car radio system you can rent, stadiums have been catering to wheel chair access for years, you also see binocular rentals, not to mention a variety of food menus from fat free to kosher items, day care, etc...
While the service, or rentals, wold not be the huge cash cow, the fact that the services are offered as being fan friendly warrents these extras being made available.