I love those speculation threads. It is sufficient for one poster to throw an idea in the ring and lots of fighters come out.
The CX SL (like often OWBronze for other airlines) is a great way to enforce loyalty for not-so-frequent flyers.
Removing lounge access on CX flights for SL would be a bad move. But I am not an expert, nor have any connection to CX management. Just common sense.