No surprises, I believe we are as of late and will continue to see more wood handles especially on higher end knives as a result of the reasons you list above.
From the knifemaker's perspective it seems almost a no-brainer as with wood you avoid the scrutiny/risk associated with ivory, the increasing costs and difficulty finding acceptable stag and wood typically being one of the more 'maker friendly' materials to work into a handle.
As for the collector; wood handles will becoming more desired at all price points, partially by default. Look for more and more knifemakers to take up carving/checkering and using woods with interesting origins (Jerry Fisk) to distinguish their handles/knives from other makers.