I doubt that they'll find a use outside of computers sporting 4-5 figure graphics cards for 48gbps connections in the foreseeable future.Hoping to wait for HDMI 2.1 as well.
That HDMI 2.1 will also involve new "Ultra Speed" cabling assures that cabling will cost a small fortune until the standard becomes pedestrian and I can't imagine that happening at the consumer level.
While the tech freaks like to dream about 8K or 16K or 120Hz video refresh rates some day in their home theater, I can't fathom how or why that would come to pass.
Perhaps I just lack imagination but all I really want is 1080p with HDR and WCG and at this point, nobody has seen fit to deliver it. The only "format" that seems to support such a thing is ATSC 3.0.