I've said it many times and will keep saying it. Running qbs never work. They are good for a short while and that's it. Lamar hit his ceiling last year. Unless he does something drastic like learn to become a pocket passer (kinda like what Allen did with palmer) the Ravens will continue to get worse. I could see them being a 7 win team next year. Running qbs always get figured out.
Another factor is the fact that the more people in a place the more the sound is absorbed. So while 70k people will still be louder, 7k people can still make a heck of alot of noise with less sound being absorbed by 63k less bodies.