The best response to this would be a tonne of challenging new content but without a huge studio to produce it, we're in a quandry! A veritable pickle, right? A jar of pickles... a truckload of pickles that has spilled onto the highway/freeway/motorway/autobahn and are being sqashed by all and sundry, oh the humanity!
On a note of some kind, we're supposed to be superheroes, so obliterating waves of minions SHOULD be easy peasy and commonplace, but then the BOSS should be challenging (but where do you draw the line between a bag of hitpoints and a stupid dancing raid-like fiasco?) - I've gone off topic. Oh I started off topic and then went more off topic. Amazing.