The march from Analogue to Digital: Why Interlace vs. Progressive Anyway?

[geoperknis]

As I ponder digital display technology, the whole concept of interlacing and progressive scanning seems inappropriate. I understand the original need for this process - an electron gun, aimed using analog amplifiers to scan back and forth across a phosphor coated tube - but now with discretely addressable digital emitters, there is no "scanning" and the concept of interlacing or progressive makes no sense what-so-ever. Every display pixel (all 2 billion of them) can be virtually instantly and simultaneously controlled to be on or off. There is no longer a need for marching orders from top-to-bottom, left-to-right and to fire in sequence... or is there? If so, why?

Looking for the digital elite out there to respond to this one.