WIFI is a common technology used by us in daily life in the form of different gadgets and devices. Your current modems and routers do have certain capacity at which they can operate and numbers of users in every home is getting increased everyday, IOT also plays a large role in it.
Right now Nighthawk Mesh Wifi 6 is the fastest available router in market but it is costly to purchase. Once this technology gets more refined then most probability they will be available at cheaper price for retail users.
Iphone 11 and pro already featuring WIFI 6, making it lucrative for users to buy them and increasing competition for other vendors. Its max bandwidth can be 9.6 Gbps which was previously only 3.5 Gbps in WIFI 5. More steady adoption of this in new devices is still needed and you might end up automatically buying devices which feature it.