Now you are trolling. I'll pull this out of my ass but most of us are lucky to get above 3mbit. Here in Seattle, I can't get more though DSL.
If you can't see why people would want to burst to 150mbit and beyond, you have a serious lack of imagination. Here, I will use mine with tangible things i could do better if I could burst above 150mbit:
1) better VPN into work. It would be quicker to check the source code repository out.
2) faster online backup, and more important, backups that down slow down the Internet for everything else.
3) Uploading stuff to client FTP sites would be orders of magnitude faster.
4) software distribution would be faster thus people would do it more.
Nobody will be saturating their Internet, but the fact that everybody will be able to burst to speeds approximating that of a LAN will open many new doors and enable things that were not feasable before. I don't understand what is so hard to imagine about that.