I will be actively seeking out DisplayPort-compatible devices for all future A/V purchases, and will recommend the same for anyone who asks. I have just become a DisplayPort evangelist.
So you're not going to get any new A/V purchases? The reason DisplayPort is virtually non-existent is that it lacks a chunk of livingroom specific features. E.g. eARC, CEC-Passthrough, those are all things you need in your TV to communicate correctly with receivers, speakers, and bluray players (If you're a physical media kinda gal) There's no Displayport alternative. In fact without HDMI it's not possible to route Dolby TrueHD, Atmos, or DTS:X to a receiver as the alternate audio connections don't have the bandwidth for it which would limit your sound options, and that's before you consider the point of ARC in the first place, without it you're back to a million cables between your pieces of equipment and reaching for the remote to change audio and video channels independently.
Displayport is superior for anything video related. But there's a reason it borderline doesn't exist in the A/V world.