They (LockMart/Leidos)have updated the systems used and make more services available online (directly from FSS) than before.
But no solid evidence (that I've seen) that it has been any cheaper in the long term.
I think the biggest problem with the existing system is that the hardware they depend on is getting nearly impossible to fix. And the FAA has not been able to upgrade it. IBM won a contract to do so and failed (and I'm not necessarily blaming IBM, I wasn't on the inside and there are so MANY reasons government contracts can go sideways that have nothing to do with the contractor).
This is fairly vague. When you say the gear wasn't possible to fix there's a lot of parts between a radar dish spinning around and a controller's screen. The radars are a well known entity and actually not that high tech nor hard to repair. People to DO it as a living are a little bit in short supply though. Not many people see a long term career in civilian radar maintenance being for them. Military, definitely. Lots of neat things going on there, always. ATC radar is pretty much the bottom of the heap when it comes to "interesting radar jobs".
NextGen was/is supposed to make the spacing tighter safely, and to make the ascent/descent smooth all improving capacity.
No. Flat no. It was not. No technical document EVER promised that from ADS-B. The only place you'll find it is in "NextGen" marketing material. No specification EVER promised ADS-B would do any of those things OR ever be primary for ATC target data. There were numerous documents that said the radars had to remain with not even a hint of them being decommissioned.
And it would/will if they can get the hardware and software in place to support it.
It will not and can not. Just the fact that it's spoofable kills that, let alone various other problems. The entire thing had to be re-designed to even fit in the time/spectrum allotted in dense traffic areas, or we wouldn't have UAT here and nowhere else.
I think the idea behind privatizing it as a service contract allows the contractor to upgrade the systems as they see fit as long as they meet the service standards. This removes the government red tape involved in upgrading systems. It might even be set up as an incentive fee based contract so they make more money of they improve services based on a predefined set of measurements.
Having worked as a sub-contractor on an FAA tech contract, procurement doesn't work this way. I'd love it if it did, but no Federal agency ever will say "This company has a contract to provide our services and we won't oversee any of it. They can use whatever technology they like..." We had mountains of paperwork documenting an outdated system that we HAD better and newer gear rolling out the door to customers that did all the things the FAA system did, and much more. But it, like avionics, wasn't "certified".
We sold the FAA the ancient one. We weren't going to pay to certify the new ones, FAA via our upstream contractor was paying triple what the new ones sold for easily, and wanted us to pay to certify the new ones... LOL. Nope. Here's the old one. And our invoice.
Y'all want a new one? We'll ship it to you and let YOU certify it... it's 1/3 of the cost. Your choice. We aren't paying to certify squat.
Answer from both FAA and the upstream contractor: We don't care what it costs. Whichever one is certified we will be buying that one. We are the only people bidding. We don't care what any of this costs.
No competitor ever tried. They didn't want to pay for certification on products that had dropped 1/3 in price market-wide as they got better and cheaper. See how they were stuck?
How did ours get certified? The military bought one. Literally one. Someone decided that was good enough to sign off a certification somewhere.
There's a lot of parallels here with avionics if you dig a bit. But ground components? Sell to the military first. They buy it, it'll fly through (pun intended) FAA's procurement processes. For whatever reason. We were one step removed from it. As long as we gave the thing a part number that anyone could order, it was COTS and met the requirements of the integrator/contractor above us.
If someone did actually call us and want to buy one, we'd offer them the newer ones we sold at 1/3 the price. Guess how many were sold to the private sector? Zero. But it was available so it was COTS.