I have used CDNs that can max out an 80mbps wifi connection, and could probably do well more than that if given the bandwidth. With OS updates now in the 5GB range (OSX), games in the multi-GB range, and even video versions of podcasts now clocking in over 2GB in some cases, the more download the better.
As for upload, I'd love to have 10+mbps of upload. When backing my files up to Backblaze, I can use up to about 8mbps of bandwidth, but Comcast only gives us 2. Now imagine a family all getting back from vacation with a collective few hundred GB of photos and videos to back up, and you're using all that upload very quickly.