I am waiting since about two years that my ADSL line gets switched to rate adaptive mode (ADSL RAM). This would allow my modem to try to use the line until its limit, instead of the fixed rate it has now. I can not get a higher fixed rate (2 MBit downstream), because the line is too long. My modem tells me that it could do a lot more (less than 8 MBit downstream). I do not expect that the modem is able to fully predict what it can do when it is allowed to max-out the line, but I expect that it is more than the 2 MBit I have at the moment.
Yesterday a technician of the line-provider I know told me that they are now allowed to switch lines to ADSL RAM (at least in my region). Great news. I directly told he shall have a look if he can switch my line. It will be interesting to see what I am actually able to push/pull over the line… and if/when the line will be switched (it will be done the official way by one of his colleagues).