Entrepreneurs and Manufacturers?
Opportunities would abound. Large corporations which now rely on making maximum profit from cheap, shonky and second rate goods would face serious competition from smaller operators with lower overheads (due to site rents), so would have to improve their game or disappear. People would have much more money to spend, and would therefore create many more new markets for the enterprising entrepreneur. It should be remembered that if, prior to the change, the entrepreneur was getting the bulk of their income from productive work, not from site rents, then they would be bound to gain from the proposed change. Those with capital already at their disposal could if they wished put it to use establishing new enterprises or improving existing ones, and so benefit from the new system which allows them to retain a much larger portion of the wealth they generate, while at the same time returning to the community its rightful share of the community generated site value.