I can still agree that there is a use case for DVI on motherboards, laptops and low end video cards (though modern iGPUs greatly diminish the usefulness of low end dGPUs), but I don't see DVI being useful at all anymore on modern graphics cards. DVI just doesn't have the bandwidth to push high resolutions and framerates, and VGA is even worse in that regard, so the ability to easily convert DVI to VGA isn't of much use either. If you got a high end graphics card to drive multiple monitors, DVI again hampers this since each link needs a discrete clock, so you're going to end up having to use DP anyways.
Where dongles are concerned, I don't see where the issue is. Video cards have been coming with DVI to VGA adapters for years now, so it's already something people are used to, and I don't see how changing it to now be a DP/HDMI to DVI adapter will change much.
DVI should remain on motherboards for a while longer till DVI really is a truly dead standard, but it should have been removed from mid to high-end graphics cards some time ago, and the second slot should be all vent.
Regarding HDMI, though. It's actually a little sad that seems to be the main standard for monitors now, since it being designed for home theater use limits it's practicality for PCs. As with DVI, the discrete clock requirement limits the number of minotirs that can be hooked up, and with power users demanding higher resolutions and framerates, and HDR looking to get started on the PC platform as well, HDMI has always been behind the curve on bandwidth having to resort for chroma subsampling while users desperately wait for the next revision. Meanwhile DP has always had more bandwidth than is seemingly necessary, and has supported daisy chaining and hubs for some time now which is something only Dell seems to take advantage of.
