Small Photo Printers

Saw this ad for a compact printer, which the customer takes along on trips and as and when clicks photos can take print outs.

Seems that this market for such compact printers is driven by the need for people to print their photos. So what difference does it make to the user to have a photo printed?
-- maybe it is the need to have something tangible in hands that drives the need to take printouts. Also a photo printed can be easily shown to people. It does not require to boot a Pc and more importantly need a PC. So what about hand held portable devices which can display photos? Would that dent the market for portable small printers?

Or would humans always need to print photos?

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