Are you surprised? Great hack by the author, the impact could be huge if someone is targeted, but overall the impact is very minimal. The vendor can't be bothered. For you to be a victim, you have to own this device, and your attack has to know that and be within a close proximity. Remember that fight club quote?

A = The number of speakers in the field. B = The probable rate of getting hacked. C = The average out-of-court settlement.

The Decision: If the cost of not doing a recall/fix is greater than the cost of a recall, they initiate a recall, yada yada yada (Note that the big cost is if people will stop buying future speakers, I think not)