Well those are about as generous as caps can get and I'm sure we'll never see caps this reasonable in the US.
Then again, we don't exactly have 100/100 FTTH connections available yet and we'll be lucky to even see that with FiOS anytime soon. Atleast Verizon doesn't cap FiOS for now, let's hope things stay that way and if we're lucky we'll see that 20 symmetrical make its way up to 100 symmetrical.