I guess I missed the part about "greed" in the OP (I was tired when I read it and posted).
If I thought that a new edition was being released, simply for "Greed"s Sake: NO, I wouldn't buy it, even if it was a good game.
However, some qualifiers:
I don't believe that 4E was made simply to make more money (i.e. Greed driven).
I believe that 4E was made for multiple reasons, one of which was to reinvigorate their revenue stream. To me, that's not greed, just smart business.
The other reasons 4E was made was to improve some of the shortfalls associated with 3E (quick and easy learning curve for new players, ease of prep and execution for DM's, clean up/simplify/repair wonky and overcomplicated rules, etc.). I feel 4E was very successful in some of those, but the approach taken created other problems IMO (oversimplified, more restrictive, less options, lessening of versimilitude, etc.).
For me 3.5E (well, more accurately
my "houseruled" 3.5E), better fits my game style and preference. I'm now very invested in it. So, even if WoTC released a perfect or nearly perfect set of rules, based on my gaming preferences, I still might not buy it (although I may just be curious enough to see what it has and buy it anyways

).
If a 5th Edition were released today, simply in order to try and win over those who didn't switch to 4E (in other words, in order to get their money, i.e. "Greed"), I highly doubt it would be a very good rules set, and probably not worth the money. That right there would probably make it an exercise in futility.
But, bottom line, whether a large percentage of the gaming community has switched to the new edition or not, it seems people are buying material anyways. Some of the most telling polling datas (IMO) that came up on all of these recent ENWorld polls, is even though more ENWorlders haven't switched (or switched and went back) than have switched, more than 80% have bought the 4E core books, and over 60% are continuing to buy 4E material (adventures, supplements, DDI, etc.). So, as far as WoTC is concerned, do they really care whether people have switched if they are buying new 4E material anyways?
So in short:
- If a "perfect" 5E was released today, would I buy it? MAYBE
- If a 5E, purely motivated by "Greed" were released today, would I buy it? Probably, NO. But mostly because I feel such an edition would probably suck, thereby negating the "perfect" aspect.
- If a "perfect" 5E was released today, even if motivated solely by "Greed", would I buy it? Again, MAYBE.
- Did the poll need a "Maybe" or "Other" voting option? YES

