The only problem with your idea is that severs cost money, and there is not enough of a variety of people who would go and download maps.
They would also have to take the time to convert/remake all the maps, when they could be doing another project. Lets not forget IT is an older game, and was always had new things added, just like FeralHeart. There will always be new things here, even if they don't come fast enough.
Kovu probably did consider placing the maps, but again, this game is payed for by the mods. They keep the game free for you. Extra costs would mean people would have to pay to get FeralHeart.
Also, IT was a popular game, but their were so many maps and servers, that some went unused. I can say from experience that alot of the maps people roam around might be found empty, or only have one player in them (Who is afk. xD)
I can imagine that in the future, there will be more maps, but for the time, there are alot, and they are not all filled.
You might even see some stuff in the future, so keep an eye out!