Theaters are steadily converting to digital regardless of 3D--it's just a matter of how fast it happens. 3-D is the same crappy gimmick it's always been, but it allows theaters to charge a premium for tickets. Film distributors would love nothing more than to switch over to digital distribution to save the enormous costs of making and shipping film prints. I think there will plenty of cinematographers that continue to insist on shooting film, but the distribution channels will be mostly digital. A lot depends on the cost/benefit of converting screens to digital. It's still very expensive for the complete setup that includes projectors/servers/etc. and theatre owners know it will all be obsolete quickly.