Not really -- over the oceans, the largest contributor to condensation nuclei are sulfates emitted by marine life. (For more: http://www.vivoscuola.it/us/rsigpp3202/umidita/attivita/CCN.htm, http://www.atmosphere.mpg.de/enid/1vl.html) Plus, there are other sources from the land that are carried across the oceans by the trade winds -- pollution being included as one of them. Eliminating salt content would likely have a negligible impact on hurricanes, but a very large one on marine life, considering there are many species that can only live in either salt or fresh water (and not either or).