I really doubt it'll increase it, but I hope I'm fucking wrong. The DLC pool seems dead when you're partied up with 4 or 5 people...otherwise if you're a lone wolf or in a 2 man party you'll find matches pretty quickly.
I played the new block lab. I'm not really sure how I feel about it, but I'm gearing towards the side that I don't like it mainly because there's really NO places to climb whatsoever. It's like London Streets...where you're just running and gunning, which is OK, but Uncharted is all about traversal which includes climbing up places. The color scheme of this one really hurts my eyes for some reason and it's hard to tell what the hell is going on most of the time due to the bright color scheme. I'll give it a few more tries, but Block Map 1 was 100x better than this one.