So from my experience... If you get a good deal on a decent HDR set. Go for it.
Gaming boards will always tell you to wait on everything. When I was looking at graphic cards some time ago everyone was telling me to wait for the pascal, now I look at pascal stuff and people are already saying you should wait to hear more about some new thing that's coming (don't remember the name).
Same with TV's. You shouldn't get a 1080 set because 4K is getting cheaper, you shouldn't get a 4K because the ones with HDR at affordable prices are coming, now you shouldn't get the ones with HDr because there is better HDR coming and by the time those are affordable you probably shouldn't get one because some other feature is comming