Will there be as much money in the e-signature business as there is in the e-fax business? The latter seems to be saving the user from a bigger hassle, hence t

Will there be as much money in the e-signature business as there is in the e-fax business? The latter seems to be saving the user from a bigger hassle, hence the obvious monetizability. What happens if google docs adds the ability to add physical-esque signatures?