There are many arguments both on the "for" and "against" side of
whether their should be more organic farms.
The main "for" argument is the "depletion of the environment,
overuse of pesticides/fertilizers and loss of natural habitat for
wildlife through intensive farming". There is also the "cruelty to
animals farmed through intensive farming methods" argument.
The main "against" argument is that "it is not possible to feed
the world's population through organic farming methods, because
organic farming yields much less than conventional farming
methods".
Personally, I think there is a happy middle-ground to be found.
Also, many farms are "organic" in all but name, due to various
issues associated with being certified as organic.