Yes, you need to get rid of a few of those and get better touring bikes.

Miyata 610, replace that with a Miyata 1000, the 610 is not even a touring bike. if you can't find one, Miyata made a rebadged 1000 for Univega, the Specialissima.
Schwinn Voyageur SP, if it has the canti brakes keep that one. I hate most Schwinn bikes with very few exemptions, this being one of them (nervex lugs paramounts being the other).
Fuji America, not a bad bike but drop it like a rock for a Fuji Series V.
Bianchi Randonneur, not a touring bike, but it should get a pass if you have the rando front basked and dynamo lights. You definitely need the lights for all the 400km rando events you'll probably never do. Get rid of the rear rack, it makes it look less rando.

In addition:
You need a Trek 720. You can limp on a 520 if need be but keep an eye out for the 720.
Specialized Expedition. Not the sequoia.

There are a bunch others but that should give you 7 bikes, enough for one a day.

Also get rid of the nonsensical notion that if you don't ride it, you should get rid of it. I swear kids nowadays...