Not to be funny but what's the point of faster than 150Mbit?
Seriously unless the information is going into your ram and right back out the machine.. your Hard Disk won't be able to save it that quickly so you'll be limited to your RAM size then wait for it to then 'download' from your Ram to HDD being longer.
It would be nice to have faster and cheaper broadband available to more people; but oddly enough I'm quite happy with my 1Mb line. I mean going back to 56k and yeah it feels horrible and laggy; but when loading sites they tend to load in a matter of seconds.
The only thing it'd change would be the streaming media like video's to have proper full-screen stuff real-time. Then again most people cards can't handle anything larger than 640x480 without crying out (given the most popular cards right now are the FX5200 and R9600) and I can stream that just fine on my 1Mb
I mean it's all well and good claiming we can have awesomely quick media and such but like CPU, RAM, and Graphics Cards... there is more restrictions on what your can REALISTICALLY expect than just on how quick one component is. You know what would be a god-send; if one of these telecommication companies could actually focus on the REAL problems. Lag and Transaction Falloff.
Something that kills my connection speed 9|10 is the simple fact that the exchange is lagging, or it pings out due to an overloaded server. No matter how quick a connection is they will ALL be affected by this.