There is a push to really establish a solids ADS-B network across the nation. Receivers that connect to the Internet are being offered to ground stations in limited coverage areas. Airports are great places to set up an ADSB antenna. An ADS-B receiver can receive the information and transmit it to computer servers over an active Internet connection. The GPS fix information can give more precise information than regular radar systems. This is a big help to ground control systems for aircraft separation and timing.
I would imagine you can adjust your safety margins when you know that aircraft are really a fixed distance apart rather than having a range. If you just have a range of say 3 to 4 miles, then you will err on the side of safety and say 4 miles. If you know an aircraft is 6307 feet away, that is a whole lot more precise. This makes ADS-B receiver info very valuable, and it makes establishing an nationwide network with no coverage holes important. Aircraft in the States are supposed to be required to have ADS-B capability by 2020.
I am for using it now. If you are buying or leasing a new plane, you should make sure the avionics are already on the plane. This eliminates the need to upgrade when 2020 rolls around. That is, unless you switch out planes every couple of years. However, even if you are mega rich and buy a new plane every six months, you probably want all the bells and whistles including ADS-B capabilities. Who knew that GPS technology would be in use in all of these innovative ways when it first came out? I remember when only the military had access to accurate GPS info. Then President Clinton made precision GPS available for civilian use.