I really don't know, but, possibly because it costs a chunk money to modernize. If it does, why do it for a facility that is no longer a local entertainment mecca. These days ticketed events of any substance consists of up to a dozen and a half men's hockey games (with an average attendance of only 2,181) with a few other events a year requiring ticketing. Total annual events requiring ticketing numbers less than two dozen.
Maybe go tech if the facility was still the "Madison Square Garden of Upstate New York" but it isn't. Back when it was and a couple times a month or so hosted the likes of Frankie Avalon with Connie Francis, Dick Clark's Winter Caravan, The Beach Boys, The Doors, Jefferson Airplane (before they went to Starfleet Academy and became a Starship), Peter and Gordon with Manfred Mann, Peter Paul and Mary, Alice Cooper, Meatloaf, a Frozen Four (1958) and an entire week of Ice Capades annually then maybe you could have used technology.
There is also a local legend of sorts that in the later mid 1970's the Fieldhouse was trying to become a stop on a Northeast tour Elvis was going to make in the fall of 1978. Fact or wives tale, what is indisputable fact is that Elvis was already booked for a show at the Utica War Memorial that fall. Of course, Elvis had an accident in 1977 and was no longer touring by 1978. If the Fieldhouse was still relevant enough to possibly be in the running for shows like that, then you would need technology.
There were many many more luminaries who performed at the Fieldhouse but it was all a long long time ago. Today, nobody who is anybody is going to perform there so do you really need possibly expensive high tech that is basically just going to gather dust for most of the year???