Today it is problem of economics.
Coconut trees typically grow in state of Kerala, a lot of the population there work in the Middle East oil economies , the pay is considerably better there. Paying competitively does not make enough money to be worth the effort.
Coconuts outside the big cities event today are dirt cheap you can get a dozen for something like $1.
Kerala is not easy place to be a immigrant, It is big semi urban region - think like American suburbs. There are hardly any cities where immigrants can get affordable housing, this is because lot of the money the state makes comes from remittances from middle east, they don't feel the need to migrate to the city for better jobs.
In recent times there has been some immigration into the state from North Eastern part of India especially in the food and construction sectors - housing is on-site or the restaurant is in the city.