What are the advantages of digital projection for the consumers?

The big advantage of digital projection is the picture quality. With film, every imperfection gets shown as the 35 mm print passes through the projector, including scratches, fluff, blotches and so forth; not exactly what the director intended for their creative vision.

Why has there been a slow take-up?

It's taken so long because it's been a question of agreeing in advance," said David Hancock of Screen Digest. "It's been a consensus building process, which started in 1999 with the first commercial release of Star Wars Episode One.
"Since then we've had five years of testing the technology, building a consensus and agreeing the business models and technology to be used, and this took longer than most people expected."

Why is 'Hollywood' driving this technological change?

The Hollywood studios are driving this transition because they stand to make enormous savings, which they can pass on to the cinemas themselves

What does digital projection offer in the way of the "future" for cinemas?

With a digital projector you can input virtually anything into it," said Steve Knibbs of Vue cinemas. "[We can screen] a DVD, a clip downloaded from YouTube, gaming from a digital projector with multiple players on the screen at the same time, a live feed from satellite, cable and whatever.
"Anything we can get as an input we can put up on screen. That means we go from being a place where you can just see 35mm films to becoming a true general entertainment place providing everything from gambling to gaming, educational lessons to movies they might not have seen for 40 years, and all sort of things like that."