I've been following the display industry for a few decades and would be absolutely stunned if DP 2.0 came to actual products in 2020. The standard was just released. Usually it is 2-3 years before you see end-to-end functioning products after spec release. Remember you need a DP 2.0 video card that needs the transmission controller baked into the silicon and you need a DP 2.0 chip (yet more specific silicon) in the display. The HDMI 2.1 Specification was released in November 2017 and we may be lucky to get a video card with it in 2020.
Lol hence me saying displayport 2.0 will be with us as "soon" as hdmi 2.1. Its quite sad on the lead times.
Its bad full stop with monitors though. A new one is announced and shown at shows then one year to 18 months later its finally available to buy and by then its out of date and behind the times.
I am still rocking my Benq 32" 4k 60hz ips screen i bought for £450 several years ago. I would like to upgrade to a hdr 100hz or 120hz screen of similar size but suspect i will be waiting a few years more.
And at £450 it was a top quality screen with great colour matching and semi pro for photo work as well as being able to overclock to 75hz and has freesync built in. No light bleed either.