Ultimately, we need to steward all of Earth. Indigenous cultures attempted this, but then they were bellicose to each other, and on top of the white plague wiped them out at the end. So stewardship went into the hands of people who were largely disconnected from the land.
Regenerative development at scale implies that we can collaborate and solve this, to reverse diversity loss on all fronts, human and wild.
The world relative to its human population is quite large. It is 123 billion acres in size, of which 37 billion acres are land. See Who Owns the Land. Furthermore,
Of the earth's 57 million square miles (148,000,000 km²) of land, approximately 12 million square miles (31,000,000 km²) are arable; however, arable land is being lost at the rate of over 100,000 km² (38,610 square miles) per year. 
In a collaborative economy, we envision stewards on 1000 acre parcels to reverse soil losss and loss of nature. We envision integrated agroecology - where you cannot tell nature from agriculture. That means we would need 7.7 million stewards to nurture all arable land.
In the United States, we have 1.5M square km (370M acres)  of arable land, and it would likely be sufficient to convert this to regenerative use as above in order to transition America to a post-scarcity economy. In America, that would be about 370,000 parcels of 1000 acres. Texas has a huge part of this, 130M acres .
Training regenerative entrepreneurs to resettle the land has a large potential market indeed.
In order to train so many Regentrepreneurs, we need the first demostrator 1000 acre farm to take place.
Upon training the first 12, we can rinse and repeat a facility cycle every 3 years, with class size increasing from 12 to 24 and 48 at each cycle. 12 to 288 to 13k in 9 years from 2028, or possibly an even more accelerated schedule.