BCNext doesn't propose to change 1B limit, he is even against it coz this would break forging. His idea is similar to issuance of eDollars on Asset Exchange.
Oh - I thought the purpose of the Asset Exchange was always going to be for such things. At the end of the day I think that the AE just brings the Nxt functionality closer to Ripple (which may or may not be a good thing).
This was my thought too.