I'm surprised a place like Harrah's hasn't gone 100% 6:5 yet. I can't think of any reason for them not to at least try. Even gamblers who understand the implications of 6:5 will still play it if it's their only choice, because they're gamblers. It's only a matter of time before a few forerunners convert all their blackjack games to 6:5, and then only a matter of time after that 6:5 is ubiquitous.
So, do the exact opposite of the comical suggestion to take it easy on places that offer better games. Pound those places hard and do it now, before it's too late. 6:5 is an inevitability, because casual gamblers are largely insensitive to increases in the house edge on any and all casino games, including blackjack. In fact, Gary Loveman recently gave a talk on this very subject in the context of slot machines, that Harrah's had determined that slot machines got the same amount of play even if their payouts were made less favorable for gamblers. So, under Loveman's leadership Harrah's has tweaked its slots in general to be more favorable to the house. The NGC sets limits on how unfavorable slots can be to gamblers, and I imagine Harrah's is right up against those limits across all their machines by now.
Ploppies don't care; they just want to gamble. 6:5 or 3:2, they just don't care. There is simply no reason for casinos to still spread 3:2 games other than tradition, and that isn't enough to keep them around for very much longer. The biggest of whales can always request certain rules anyway, so the casinos don't have to fear losing their best customers if they change to 6:5 on all their tables. Emerging whales will be accustomed to modern conditions, and in time these new whales will play 6:5 just like everyone else, because it's what they're used to.