What I want to see... The whole sandbox building idea Kern described, resource collection, logistics, having to defend resource convoys, building refineries and factories and fortifications...
What I absolutely don't want to see: Kern's successor's BS EvE style economy attempts. In fact, I don't want to see anything that resembles EvE in the slightest thanks.
I want to see players working together to build things and repel the NPC threat, I don't want to see players fighting each other to take control of stuff for their guild or org or whatever.
I want to see the sort of gameplay we saw in that first demo video of Firefall back in the day, going out and mining, guarding the thumper, heading back in to town and buying stuff... I don't want to see there being 200 different kinds of resources and quality levels and crap overcomplicating the crafting system like it had devolved into by the time I finally ragequit the "beta" (I put that in quotes because they were taking my damn money at the time and still claiming it was a "just a beta").
I can't even remember all the changes that started happening that led me to finally quitting the game. I do remember they started happening after Mark Kern was pushed out, which makes me rather suspicious of the claims the team made about him after he left.
I remember the changes to crafting, limiting people to doing one type of crafting in some asinine attempt to force us to have a player-driven economy... That was a big one for me, especially given the whole system they created was half-assed, intrusive, and frustrating. I remember the straw that finally broke the camel's back for me was when they completely gutted my turret-focused engineer because of people complaining that it was too static, when the whole design intent for that specific engineer type had been that they build up a static defensive emplacement... Might sound like a small thing but they'd put so much grind into the game, and that class was the *one* thing I'd fully maxed out, which was a huge investment of time.
Actually that's something I'd like to see in any Firefall successor... Something equivalent to that design, a class that is focused on constructing and maintaining fortifications.