They should bring back Time Cruisers: it was just so, so weird that we need more of it. It would be nice to see something fill in the $5 system-based niche that X-Pods and Mixels left open (it doesn't have to be Mixle's, just anything good and cheap like that). I'd be cool to see more brick-built animals from creator, as we haven't gotten much of them for a while. Mechs with knees should make a come back (seriously, everyone always says the Fire Mech is great, but to me it just looks like a big waste of money and space because of its lack of articulation (unless you're just gonna scrap it for parts)and so I prefer the previous, cheaper one). Also, buildable figure f characters from system themes, like Knights Kingdom II and The Legends o Chima. If they did that for girl themes, it could result in very interesting new parts, and perhaps tap into a market that could keep constraction alive for a lot longer. (I mean, Bionicle G2 sets were more like dolls in the traditional sense than action figures, anyway)
Star Wars could end and I wouldn't care much, same deal with most of City. Although, if they rebranded most of city as being like a smaller version of Modulars, releasing mostly buildings, I would begin to care more for it. I think that they should dial back vehicles for city, and put the resources into more action themes and whatever Racers line is currently going (I never cared for them much, either, but they have made some very useful parts).