It's my understanding there's no limitation on the number of H2 visas at all, so quotas aren't an issue.
Travel for the Mexican peasant, not a problem for since transportation is provided by the employer. Might be a financial problem for the employer.
Yes, it involves planning. But agriculture pursuits require long range planning. That's not a particular impediment.
Other impedimants, imo important ones, are payment of prevailing US wage rates and certification that sufficient American workers are unavailable at the prevailing rate.
Making enough visas available is the same thing as a guest worker program. Make them available to people already in the U.S. and you'll be attacked for giving "amnesty."
"It's my understanding there's no limitation on the number of H2 visas at all, so quotas aren't an issue."
Incorrect, according to this piece.
"Then there is the H2-B visa, which was designed for seasonal agricultural workers and service industry employees but also includes minor-leaguers from foreign countries, as they work in America for set sport seasons.
These are the visas that allow American clubs to bring up players from the leagues they sponsor in Venezuela and the Dominican Republic, as well as Canadian high schoolers drafted each June.
The system worked well until two years ago, when in the wake of the Sept. 11, 2001, attacks, the government lowered the cap on the number of H2-B visas to 66,000 per year, down from more than 120,000 visas in past years."
http://www.coxwashington.com/reporters/content/reporters/stories/BC_IMMIGRATION_BASEBALL03_COX.html
But there is no reason why American teenagers couldn't do this work. After all that is the original reason for their summer vacations!!! I did it! So can they!!!
http://www.palmbeachpost.com/hp/content/moderndayslavery/reports/h2a1209.html
http://www.businessweek.com/2000/00_23/b3684204.htm