Consolidation in this space, in my opinion, is putting the future of the Internet in great jeopardy. I'm not sure exactly where we're heading, but i have a feeling the days of a "free" internet are numbered.
These things will matter more as high quality content increases in availability. I also suspect you haven't recently tried to upload any amount of volume (photo albums, videos) on your mobile connection. I'd even consider it dangerous to compare the two, because the only folks I've ever seen consider them analogous are the ISPs themselves and only during takeover conversations, and only in reference to monopolies for service in particular areas (Comcast isn't your only option, you could also use your phone!).
Not to mention how completely untenable it is to play video games on a mobile connection.
Which they will literally never do. They have no incentive to. The absurdly low caps allow them to consistently charge overage fees/print money.
They do, though. I pay ~$50 a month for my cable - if an LTE mobile operator offered a higher cap for even $45 a month it would be tempting to switch over.
edit: this is actually a more complicated issue and a large part of the blame needs to go to state/local governments who impede progress and competition in broadband infrastructure. http://www.wired.com/2013/07/we-need-to-stop-focusing-on-jus...