Are you talking "4k streaming" as the current streaming providers do it, with trash bitrate, or "4k streaming" as you would do it if you had ripped your own blu-ray disks and you want to stream it from a NAS somewhere else in your house to your living room?
https://www.tomsguide.com/tvs/forget-streaming-services-here...
I think not having a 2.5 gigabit port at least is a poor choice.
Press X to doubt, isn’t a large part of country under Comcast (aka crappy monopolistic cable)?
Obviously the subset of users with multi-gig fiber is relatively small, but not practically zero like the comment suggested. Anecdotally, 3 Gbps fiber is widely available in my medium sized US city of about ~500k for as low as $110. I paid the same for asymmetrical gigabit cable internet in the last city I lived. It just depends.