A mixed adventurer set would be a welcome addition, however like Bryon I'd end up having to purchase at least 3-4 (hey I could live with that!). I'm sure however most would only purchase one set, especially if it were to be a mix of males and females, they'd have all the figs they need for some great games.
This set really would be great however, especially for people just getting in to RPG's and collecting figs. Hopefully if you can get people in to a particular brand from the start of their hobby, then they'll stick with the brand (look at GW!), or at least return time and again to it between other possible projects wherever the hobby takes them. Call it loyalty, nostalgia, or just plain old good taste, people starting off would use them as a benchmark, and always have a fondness for the brand. Give me the boy....etc etc etc. It's something that's certainly achievable by Wargames Factory, and I have no doubt that many many people have got in to gaming Z games due to the Apoc Survivors. See, good taste still exists!
Generic Elves, Dwarves, Humans etc. as we've seen with other sets, by adding weapons, arms, heads etc from other sets would make for nigh on infinite customization. Not only that, I'm sure they'd be easy to 'Zombify' and it would be nice to see some zombies from other races for fantasy armies.
The flat neck connection, with flat/flush arm connections would be my torso type of choice as it leads to more choice of convincing figure pose and customization with the newer sets as well as the good old Persian's, Samurai/Ashigaru etc. The rounded neck connection sitting 'in' the torso is fine, but I fine it harder to swap head to torso between sets.
Open hand connections with one or two hand-holding-weapon options would be very welcome as again, it allows for more choice of weapons between sets and thereby more unique figs. It would also allow you to take the fig from Lvl 1 Adventurer, to Lvl x Dungeoneer for any RPG'ers out there whilst keeping a similar vibe for the face of the fig. More choice often means more sales.
If they'd be big hitters on sales like the Apoc Survivors seem to be (got to get me some) is another matter which is a crying shame. It's such a big risk, I'm not sure if the markets ready just yet. I really want the Adventurers/generics (so many uses!!!), but tooling, design, manufacturing....well, I can't see it happening in the near future. Still hope springs eternal!
I'd love to see a set of generic human medieval style 'archers' in basic gear. Same as some Men-At-Arms. Some swords, Bills, Halberds, knives, axes etc. Robin Hood, War of the Roses, 100 Years War scenarios beckon as well as all the fantasy implications. Kerching and great figs to boot.
I'm still hoping to get some pics of my Zombie Vixens up soon (painted before the move) but that's for another day and preferably when we're not relying on a dongle for an internet connection (hey nearly 3 months and our ISP still hasn't been able to connect thanks to a mix up with the address with the estate agents, way to go realtors).