"True" blackjack hasn't been common for years. I know of only one place that offers surrender, double on any two cards, resplit aces, double after split, and dealer stay on soft 17 - all on a single deck game.

When I was cutting my teeth on blackjack on the single deck games at the Frontier two decades ago, even then they allowed doubling on 10 or 11 only. Perhaps not as offensive as 6:5 (I'm sure Wizard of Odds has an idea), but certainly "anti-player".

6:5 will likely proliferate, but most likely where casinos feel that they don't need the 3:2 (e.g. high traffic locations, low limit games, party pits). I cannot imagine the high-limit salons resorting to 6:5. In fact, some of the best blackjack rules are there....