So, I think there's a couple problems:
I hear multiple things from people, some say Valve wants to have more innovation, some say valve want maps that are the same, but if you look at a lot of the new (non MvM) maps that have been added, they all have done something new. Now, that correlation doesn't mean causation, but it's something to note. Maybe it was the maps popularity, maybe it really was the map doing something new, maybe it was just that Valve played those maps and haven't played others. They can't play them all, so how can they know what we like or don't like?
Another thing I wanted to touch on: Innovation. There's innovation, then there's innovation done right. Sure, you can create a PL/CP hybrid (I think Grazr did it once), but if you can't properly iterate it you're just going to get a crap map thats confusing. As idolon put it, yea, people are semi-stupid when it comes to new gamemodes. With Snowplow, some people are like "yea, I get this" other people don't get it at all and we have to explain it to them. Developing a new gamemode is like developing a map, you have to properly iterate it, then be prepared to gut and change things as needed, once the gamemode is done, then you probably have to rebuild the map (if you don't you probably have a smelly piling mess of gameplay). It's hard work, harder than I think most of us understand. But if you're smart about and keep an open mind, then you can probably do something neat. Also (and this is something that I don't think a lot of people here understand or are willing to accept) sometimes, you need to start over, from scratch. You need to take what you had, learn from it and just start over. There is NOTHING wrong with that. I've had to do it a lot in the past year, it sucks, but in the end it is 100% worth it.
.... and on-topic: I disagree with Borneo going official. It's a bit too long and feels like the layout is confusing. I'm not a fan of the art too much. That being said, I saw it a few months ago, so maybe somethings changed. Honestly, I don't know what maps currently out I would say "make this official" ... probably none at the moment. So take that as you wish.
tl;dr: Innovate, but do it right. Be ready for a lot of hard work and probably restarting from scratch. Deal with it. I don't like borneo.