LOL, so many of you are not getting it.
The billion is for an entire range of improvements many that have already been implemented. Disney has already increased the average daily attraction attendance by 10%. They expect to over double that. It doesn't matter how many freaking rides they build if you can't get on them (TSM anyone?). That's a hard concept to swallow but Disney cannot build an infinite amount of rides for a finite amount of people to ride whenever they want. Even if they build an entire new park they are going to staff rides based on what attendance they are bringing in. So, I promise you this, even with a brand new park overall wait times for attractions are going to be just as long.
With this new "reserve" rides from home system you don't have to use it and guess what, unlike ADR's, you're not actually reserving rides. You're basically requesting a fast pass ahead of time to get on a ride. World of difference.
The benefit for everyone is this. Disney now has a sampling of data telling them what specific rides are going to be the busiest at what time of day. This allows them to preemptively deploy crowd control measures and to staff more accurately.
It all comes down to how many people they can process through a ride per hour per CM. Increasing this by 20% has huge ramifications. It means less time standing in line, more time having fun and more time for shopping. It also means more people visiting and more money for expansions.
I love new rides as much as all of you, but my overall park experience is affected more by how much time I waste in lines, getting tickets and traveling between locals.
You can have the greatest most immersive ride in the world but if I waste a whole day standing in line I will be pissed.