Personally I would continue printing SBD forever. I don't think there is a need to limit supply when the market is overvaluing it. Let's say someone will buy $1 bills from you for $2. So you sell them as many as you can get your hands on, or do you sell some limited number and then stop?
The purpose of the 10% limit is to cap the backing of all of the outstanding SBD at 10% of STEEM's market cap (considered a 'safe' amount) regardless of the amount of SBD in circulation. So if the market wants lots and lots of SBD with less and less backing, why not give it to them?