My $.02 is that there will be a spike in interest in Great War arms with the anniversary due to the media coverage and TV and Hollywood efforts. Sadly this means my chance of finding a good, affordable, Lebel to "complete" my Great War long arms collection will diminish a bit. And forget about a Canadian-contract Colt 1911.
Even without the anniversary, prices for milsurps will, I believe, continue to grow. My observation at recent gun shows has been that the first rifles being bought and carted around the show are often milsurps. They're being scooped by young(er) guys who have perhaps become hooked on the currently cheap and readily available "gateway drug" SKS, Mosin, SVT and Tokarev options and are stepping up to the heavier stuff.
Certainly, interest in Ross rifles seems to have ballooned over the past several years.