If unlimited SC access becomes more attainable at a lower opportunity cost (25k spend vs 75k?) I think that would go a long way to getting some of the "serious casual" flyers to stick around. Though my guess is we're more likely to see rollbacks to MQD numbers, additional ways to earn MQDs (e.g. shopping portal/skymiles dining, both of which earn LPs on AA), and an outside shot at additional benefits added to the cards and/or each tier (the big one would be C+ at booking for GM, which is offered on the equivalent status from UA/AA/AS/B6, all of which are now easier to earn than DL GM).

I could probably hit GM under the new program if I pushed some hotel/car spend towards DL portals and maintained 25-30k Amex spend. If I can maintain SC access and C+ at booking, with the occasional FC upgrade, I'm a happy customer regardless of what they call it. If not, previously set in motion plans for free agency continue.