I would write to ask Orwell if he felt that his book would encourage further dedication to revolution and social progress or if he felt that the book might lead people to a cynicism regarding social/political ideals and movements.
There is no clear answer to the question of Orwell's intention with this book, even if we know that he was writing to comment specifically on the despotism that had sprung up in Russia.
I would tell him that I thought the pigs were the least interesting characters. I would say that I was much more interested in the behavior of characters like Boxer and Mollie. I am less interested in how the powerful act and more interested in why people accept oppression. Both Boxer and Mollie accept oppression in one way or another and so I find them to be the most interesting characters in the book.