I blow through 150 GB a month but I have 2 daughters who stream everything from Netflix, YouTube and other various streaming sites. EB I think you must mean 45 Mbits as the download speed, which is about right for 4k.
Btw, if you decide to subscribe to a 4k service from your cable provider, you need a 4k box from them. It's true that there are very few 4k channels at least in Canada.
And unfortunately you won't see Tom holding the cup in 4k as the camera equipment used by the networks is still just HD. This is going to be a big cost for the sports networks to upgrade all that equipment to 4k. But even in HD it will still look amazing!