They bumped their R&D investment 1 billion dollars... not spent 1 billion dollars on one thing. This is so misunderstood and misapplied in the fan community.
NextGen is an initative - not a product. It was a collective push to double-down on R&D as a way to push the parks forward for the future. Invest in R&D to develop a wave of technology to push the parks ahead.
It's like when a company is challenged in the market.. often by competitors that duplicate your efforts and do it cheaper, but 'good enough' and the analysts ask how are you going to fight off XYZ? Many respond by refocusing their investments in their core technology research hoping to push the curve ahead of where their cheaper, usually copy-cat competitors can't keep up.
That's exactly what Disney was doing. Investing in their core competency of R&D to try to find ways of advancing the theme park experience for the future in ways that would stand out in the crowd, and potentially be hard to replicate.
There are many projects that at the end will said were made possible by the NextGen initative - but its wrong to say they spent 1 billion on new tickets, RFID bands, new turnstiles, etc.
One must also remember, the NextGen initiative was 1 billion OVER TEN YEARS. Simply put.. 'NextGen' is simply an increase in the R&D budget as a concentrated push to find ways to advance the park experience with new R&D.
RFID has just been a common theme they have been coming back to and trying to leverage as a new technology to advance their concepts.