Qantas definitely looking to crackdown on lounge overcrowding or is it part of the push to focus more on status credits than points. Generally, anyone with status would already be using their guesting abilities over a lounge pass unless travelling with larger groups.
In my use case it now makes it useless to hold the Amex QF Ultimate card as a Gold, given that my lounge passes were often transferred to my wife on the odd occasion when she would travel separately or to a mate. Looks like a great time to me to finally change my credit card.