Apparently there is a difference between adsb out and adsb in. My understanding is that a lot of aircraft already have adsb out... Its mode s paired with GPS position. The 2020 requirement is for adsb out.
If in training why would you really care? I'm not familiar with adsb's exact capabilities but can't they already get your rough position with 3/c? If stranger traffic were also on adsb it would in theory make it a lot easier to set a 5 km bubble around them and not have to knock off the entire war.
I heard rumors that the F-35 had ads-b.
I used to scoff tcas since we have a radar and an interrogator and it's next to useless when you're maneuvering. However this does make me wonder if it would be worth the cost to add. Not sure how complicated it is but heck we got them on 38s now.
Have you tried looking at the instrument approach procedures into CHS before coming up with this stuff?
https://skyvector.com/files/tpp/1507/pdf/00076IL15.PDF