The first digital photo was produced in 1957 when Russell Kirsch made a 176×176 pixel digital image by scanning a photograph of his three-month-old son.
The first digital camera was a klunker in 1975 http://www.petapixel.com/2010/08/05/...-steve-sasson/
It took a while for Digital to go consumer

So give it 10 years (or maybe a bit more) and LF digital will be 'affordable' (i.e. <$20,000 for a LF digital camera)