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I'm sure even after it ends, people will still want to play the maps. I mean, people have been playing maps like Dustbowl and 2Fort for years and they're still popular.
 
I can see Suijin and Borneo leaving a lasting impact, but who knows given these turbulent times.

It wouldn't hurt to try a gun mettle server and see how it goes after the event ends.
 
technically, the event is still ongoing, since some of the weekly contracts can be specific to the new maps.

in general, possible contract categories are either class-specific or map-specific, but there are also two categories that have neither restriction, they can be done by any class anywhere.
see tf\resource\tf_quests_english.txt for specifics
 
I say add to the rotation of the gamemode. I mean, these maps are pretty fucking great and I'd love to play them on Skial servers so I didn't have to play on VALVe servers all the time with the shit f2p's.