I don't think they will evolve much at all. Perhaps higher performance composite materials may play a roll, but I feel that the evolution of the sport will still continue with changes and discoveries of new techniques, and methods of fly ffishing. If you look at most advancements recently, they have not been done to rods, but more so with fly lines, hooks, tying materials and techniques, as well as actual fishing techniques. Not to forget reel technology advancements.
Remember that advancments in rod technology have been driven by the pursuit of species that were not previously targeted on fly. Particularly salt water fly fishing. Just about everything is now targetted, so all that remains, is to advance the techniques.
Competition Fly fishing has played a roll, with more specific Czech nymphing rods being developed to cater for the requirements of this technique.
Graphite and carbon fibre, is probably the ultimate in durable ,lightweight, high performance materials. (but then we said this about glass fibre at one stage..didn't we??)
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