Aside from that last question, these answers haven't changed in nearly 40 years.
I'd say they have, considering editions before 3rd never really had an expectation of taking campaigns past level 10 or 12 or so. There were exception, of course.
Anyway, there are also some interesting bits within the data. For example, among those that are players but don't really GM, Tier 1 is twice as popular as with everyone else (14% enjoy it the most rather than 6%). And among that same group, there's a 4% higher preference for T2, 14% higher preference for T3, and an 18% *lower* preference for T4.
I say that's interesting because it seems to show that although there's a bit of an unmet demand for T4 games, the demand is mostly among GM's rather than players. The players want more T2 and T3 games.
Also, people who exclusively GM enjoy T2 more than those who play or play and GM by nearly 27% more. The question asking which tiers are the most difficult are also very different among people who exclusively GM. 50% of those find T1 the hardest to run (compared to 23% for all data). To me, that seems to indicate there's a lack of good training for new GM's; maybe it's just that the published adventures often gloss over what makes their T1 stuff balanced and work, or maybe there's a real lack of compelling challenges to throw at the party for those levels (or maybe something else entirely). Still, it's a bit of data that shows there's a lot of work to be done on Wizards' end to avoid cutting potential GM careers short by virtue of a large hurdle right out of the gate.
Anyway, just letting you know that although the survey does kind of confirm common assumptions, the details are important (to me anyway).