In my humble opinion, Stock Photography looks to be be susceptible to commmoditzing only because now the the work flow is entirely digitized, and now the cost of entry is lowered for aspiring artists and client's have unprecedented access to growing databases of low cost and in some cases no-cost content not available or even imagined even a few years ago. It may be that the model for stock can be done more efficiently and at a lower price then through the Studio / Agency / Art Buyer hierarchy. I say forget low-balling, the cliche of the level playing field has come to fruition and only the designers who can read the wind and change tack will survive-- Differentiate or Die.
Musings on design and finance