Plus, there is no guarantee that film will archive well, Sometimes certain brands, or even the same brand but different production runs of film, degrade differently over time. Movie companies keep their archives in salt mines, because of the enormous space and climate control required to keep the film from degrading(more quickly).
With digital, its as easy as making multiple copies on archival media, than storing them in different locations. Repeat every few years.
I think "real" labs will continue to process film for some time, but prices will probably increase steadily. When you consider the time line, Digital took over film very quickly, companies like Kodak and Polaroid were left in the dust. Camera manufactures made the the transition easily, while a huge market dried up to almost nothing for the film manufactures.