I really don't think that Zam will play any further part in the series. If you ask someone who has seen the films but is not a huge star wars fan who Zam is and they'll give you a blank look.
Her name's only mentioned once and the vast amount of people who watch the films but don't religiously find out the back ground of every character will not know who she is. And as Geoge does not do flash backs I can not see how he'll make any refference to her.
Jar Jar on the other hand is well known to the pulic, tries to bring down the Jedi at every opportunity and was expelled from Gunga city for reason unknown...probably because of his secret shape shifting abilities.
It's almost certain, being a politician, that Jar Jar would be able to erase files, and order a clone army to put the Gungun's back on the political map. His your man officer!