I voted pro-4E and high sales.
(*Note: A distinctly 3E-era magic weapon.)
I realize this is discussion of people's perceptions of 4E's sales, but I thought that it was old news that 4E's first run of core books had outsold 3E's first run. Maybe I've just been taking speculation too seriously, though.As for sales, I suspect it's doing ok. Nowhere near as good as 3.0 did, but I'd say the numbers are probably ok ("ok" may mean something different to Hasbro than it does to WotC though).
I think 5E will end up being even less like 3E (mechanically) than 4E is, barring some horrible circumstance wherein the D&D license gets sold off to someone with +5 4E-bane vorpal greataxe* to grind, which would be bad because that person would likely misunderstand the positive contributions that 4E makes to D&D -- and I don't think back-pedaling D&D would improve sales in the least.On a more rational level, the sooner 4e fails, the sooner 5e will come and the more different it will be.
(*Note: A distinctly 3E-era magic weapon.)