For the carriers it's not about speed, it's about capacity. Back when 4G was first lit up our local 3G towers were all completely saturated, particularly at 5pm rush hour. They were so bad it was unusable, even our carrier at the time admitted it. I worked at a municipality with lots of 3G mobile computers and they suffered for months until 4G was lit up. Is 4G nearing that point? I dunno but possibly.
5G is seen by the system operators as a relief for bandwidth and capacity. Keep the traffic in the neighborhoods, not all hitting the dozen or so high level sites in town. That being said the 4G towers aren't going anywhere soon. Both are needed now and in the future. A lot of the 5G frequencies just don't have the range or penetration.
Only the TV marketing types and home gamer users who think their "wifi router" with 16 antennas, gigabits, and 4 bands of gigahertz, and double quadruple MIMO+ will want/believe the raw speed is going to make a difference.
There should also be a market for home internet delivered on "5G" as an alternative to fiber/cable and of course the video streaming is going to eat into available bandwidth. Just don't expect it to work during a power outage. I don't see any backup or infrastructure equipment on the poles they've been putting in around here. Just the radios, antennas, and fiber crammed into a skinny tube.