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My tires on my 15" wheels are worn out on my 1979 Bronco.
I was debating on just buying new tires for my 15" wheels but if I ever need a tire..15" tires are hard to find locally...since everyone is going with big wheels.
I would keep the 15s if you are keeping your tire size close to stock. I tried getting new tires for my truck and they only had a handful of options for my wheel size. Going 16s would be a good idea if you wanted to go bigger.
I went with 16s on my Bronco because there was a better selection of tires available. I kept 15s on my '85 F150 for the longest time and didnt have an issue getting tires.