Will you be in a position to take advantage of all the benefits of HDMI 2.1 when it rolls out? Or to put it a different way: How fat is your wallet?
The dust hasn't settled yet on the UHD and already there's talk about HDMI 2.1 to support 8K @ 60Hz, but it's premature at this stage. More importantly, no-one is talking about the impact of this or how we'll take advantage of it in the UK market. Remember, journalists and publications like to talk up some new exciting development. It's what they live for. But the practical realities are something they conveniently forget.
The UK is still stuck with SD and 1080i HD for terrestrial broadcast. Sky has UHD content, so does BT Sports. Virgin doesn't have it's own yet. The rest is streamed at whatever bandwidth your current connection supports, but if you want the full UHD experience then you need physical media and an UHD Player. So, with such patchy UHD/4K support in the UK how likely is it you think that there'll be a lot of 8K content to watch soon?
My view is that anything 8K HDMI 2.1 will be so exorbitantly expensive at launch that only those who can afford to shop without asking the price will be able to afford the cost of admission. Even now, you have to buy a premium UHD TV to get the full benefits of the current UHD/4K system. If you want Wide Colour Gamut, HDR, Dolby Vision... all the bells and whistles, then you won't find it on the £299 UHD TV at Argos. That's really the point. Waiting for HDMI 2.1 is pointless unless you've got the money to spend buying the top-of-the-range everything at launch, and more importantly, you're so loaded that you don't mind the Titanic depreciation nor the certain knowledge that generations 2, 3 and 4 will render your bleeding-edge purchases redundant within the first year of ownership.