i think it could go two ways, either in the direction of roller-blading (nearly extinct) or skateboarding/bmx. if you look at the skateboards people were riding and the tricks people were doing on them in the 70's you would never guess that people would be doing switch 360 flips to lip-slides down 30 stair handrails (not an actually trick done, maybee? i dont follow skateboarding anymore). The tricks people do on fixed gears now look similar to the skateboard tricks being done in the 70's/80/'s, alot of spins and twirls and stalls and such. but you will see some crazy fixed tricks snuck in there, back in the early 90's a 360 flip was insane, now its mandatory. i think fixed gear tricks could continue but eventually the equipment will change and probably look like i large bmx with a fixed wheel and 700x25 tires.