This is still quite a lively debate actually, but nothing is decided, the implications are not exactly yet known if we should drop hbd, but even with a broken peg, it's still a useful mechanism, for sps payments for instance. I'd rather know that my payment will be in the 0.60 to 1$ range than 0 to 10$ with unpegged tokens over a year. Makes it easier to budget the daily payout I need.
Now regarding added complexity I can't say I disagree, and @netuoso actually did a version of steem with sbd stripped away (not sure if he finished it though). But it's a lot of work to do it, and it still up in the air if it's actually worth it to remove it.
IMO, unless there is a very big push from the stakeholders to have it removed, it will stay there.
Another idea is, if we keep HBD, to really improve it (add convert HIVE to HBD in both directions, lower debt ratio from 10% to let's say 1-2% in order to reduce the debt and high inflation risk to HIVE). Removing HBD could be done in a quick way by just stopping HBD printing with a HF if we decide to remove it and then removing it from the front-ends gradually for example.