If a laundry closes, it is because there is no business there. The demographics must have changed. For example, when they passed the AZ-style immigration law here in GA back in July, thousands have left the state and many laundries in what used to be highly hispanic areas have closed. So that would be the first thing to check - has something changed in the area. Second, how many other laundries are in the area, and are they busy? If the area is overbuilt for the population, they all lose.
Second, 99% of laundries are still quarter-only based. Americans have not taken to smart card systems, and they are cost prohibitive to install. Only now have some credit/debit card systems have come to market at a more reasonable cost, but they are still on the expensive side. So that argument holds no water.
Third, talk to the landlord and see if he knows why the owner closed doors and left. He might be an unreasonable prick, or is planning to have a family member reopen it.
It might not be outdated. Commercial equipment should last 20+ years, so it just might be neglected. If most of the machines are domestic toploaders with a coin chute, they usually don't last more than 5-10 years. Go peek in the windows and see what you can see.