Not exactly to the heart of your question, but I am awaiting the nuclear bomb whereby United maps Premier Gold to Star Alliance Silver instead of Gold (maybe they'd have to change the name of their status(es) to avoid confusion). I say this as 1MM, i.e., lifetime Gold. Or perhaps the Lufthansa Group will merely deny Senator lounge access to non-LH Star Alliance Golds.

On a separate note also not exactly to the heart of your question, I'd like to see Air Astana join an alliance, perhaps Star as they have some ties to LH. The new airport in Almaty just opened, replacing the horrific old one, which may help its cause. I suppose its network isn't really geared toward connecting traffic, but I would be curious about the business model as it provides good regional coverage (granted TK serves many of the same international destinations) in addition to some long-haul destinations and provides a solid offering overall.