The only reason not to go are your own personal ones. How is a boycott going to impact Lucas? He is a multibillionaire already. If no one went at all to this new installment he wouldn't lose a penny. Pepsi alone paid 2 billion for the marketing rights to the 3 prequels back in the 1990s. That works out to $667 million for each movie. Boycotting Pepsi might be more effective. I prefer Coke anyway. The best way to hurt Lucas is to remind him of Howard the Duck every now and then.
Hollywood is currently reeling b/c patriots across the country have sent them a strong message...ever heard of The Dixie Chicks? Danny Glover? Jeanine Garofalo?