The DGT and the Santana will never be fully discontinued, even if neither sell that well. They are too important to the history of the brand.
Also, loving the talk about 594 vs original McCarty. I find the contrasting receptions of the 594 and the Silver Sky so interesting. It's like, we love it when PRS makes a guitar that's MORE like a Gibson Les Paul, but hate it when they make a guitar that's more like a Fender Stratocaster.
IMO, the 58/15 LTs are some of the most incredible vintage style PAFs I've ever heard, and a huge reason for the success of the 594. Now that the 2020 McCartys have these pickups as well, the differences are more subtle. Personally, I'd love a guitar that had the tuners and bridge of the McCarty with the Pattern Vintage neck carve of the 594. I've always felt that tune-o-matics make the string tension a little tighter than a trem or wraparound and the slinky feel of PRS guitars is a huge reason why I love them.