Don’t allow tobacco products into the park would be the easiest way.
That depends on how willing Disney is to completely exclude the "smokers" market. Because even those who are willing to adjust to DSAs outside the parks and multiple trips through security each day are very likely to draw the line at being told that they have to leave their cigarettes at the resort and take the time to go back to their room every time they want one.
I did not comment on this earlier but as I read a lot of it I have one question. It is safe to say that people will honestly no longer go to WDW because of this new policy? I don't smoke so I cannot comment on the addiction, but I can comment on my WDW addiction and could not imagine giving it up because of the change.
I suspect some of us who will give it up are just less addicted. For me, it isn't this change alone but more of a straw that breaks the camel's back sort of thing - a decade ago, it would have been unfathomable for me think in terms of not going back, to not always be planning the next trip, but so much has changed in that time, so little of it for the better, that I just see it differently now. WDW went from a place where my family could pay a small premium compared to other destinations for a vastly superior vacation experience to a place where we can now pay a huge premium for a hit-or-miss experience. That has already made our trips fewer and further between. Now adding in the fact that DH is going to struggle with balancing his cigarette addiction with enjoying the parks? It makes it even less attractive, to the point of falling right off of our destination wish list.
But like any true Disney addict, I'm not going cold turkey. We're going to be on the west coast this summer and plan to hit
Disneyland for the first time, and with the more compact size of those parks I'm far more willing to tell DH to suck it up and deal with the inconvenient DSA location. And next summer, we're headed to Japan, with Tokyo Disney and a potential side trip to Hong Kong in the plan, and DH isn't coming along for that trip so the smoking policies in the Asian parks are entirely irrelevant.
I think it's interesting how much people seem to think Disney enthusiasts are more prone to break the rules than average people. Where I live you can't smoke in public pretty much anywhere--haven't been able to for at least ten years. I hardly ever see anyone smoke. And I honestly can't even remember the last time I saw someone smoke somewhere It was expressly forbidden. Apparently all those people are at Disney...
I think that, like smoking rates, is likely influenced by regional and socioeconomic factors (and maybe a time factor as well - if the ban is a decade old and was ever well-enforced, most people have probably adjusted accordingly). At our local beach, 90 percent of the "beach attendant" job description seems to be enforcing the smoking ban, and that's a place where you can literally walk 20 yards and be in a place where you can smoke legally and where there is an ashtray and benches to accommodate smokers. People still light up on the beach. But our smoking ban isn't that old, isn't consistent (state law prohibits smoking in most businesses, but parks and such still set their own rules), and has never really been well enforced. So you see a lot of people smoking in places they shouldn't, sometimes out of ignorance (no one measures the distance from the door and few read the rules signs posted at the entrance to city parks to tell which are and aren't smoke-free) and sometimes out of willful disregard.
I'm not quite techy enough to get it to do that on purpose, but it is funny!
Every single park bathroom we went in last week was disgusting. Yes, I mean every bathroom. Paper all over the floor, smelled disgusting, toilets full of stuff...and this was with attendant's in there. 
