The coverage/range of 5G depends on the scale of deployment, and the environment of the deployment (e.g. urban with lots of tall buildings, vs rural), assuming

The coverage/range of 5G depends on the scale of deployment, and the environment of the deployment (e.g. urban with lots of tall buildings, vs rural), assuming we are talking about mmw type of 5G not LTE+ type of 5G. Due to higher frequency, 5G might actually have a disadvantage in range for a single tower, in dense urban environment due to weaker penetration. But it could be compensated by deploying more towers, at more strategic locations. The value proposition is that the gain in speed and delay would be well worth it. Weak penetration is still a problem for long range open field 5G communication, but due to different factors like fog, weather conditions, etc. Regarding data caps, I view it as more of a business model question, less related to the technical capabilities of 4G vs 5G.