Honestly I'm on the side of liking the familiar few maps. It's the same way I play TF2 and CS:GO—Dust II and Cache are staples for a reason, and so is Carceris and New Summer.
There are too many random maps in the selection that no one will ever play or learn to play because it's too saturated. And I would think that the better solution for increasing the number of maps that people play on is to get rid of most of the unused ones, so the good ones that haven't caught on yet can actually be noticed.
Usually I find one or two new maps to play and I stick to it, telling people to vote for it and showing them around and advocating for it often. Both Heat and Omega are being voted on a lot more because they had someone who was actually there to vouch for them, and get other players into the map and willing to play it.
So I think that if a new map is gonna be added but it has no one to actually promote it and show it off to the playerbase, there's no point in including it, because it'll never take off otherwise. Decrease the map cooldown, and limit the selection of alternative maps to ones that actually have someone (its dev or a fan) promoting its popularity.