Do you think Martin Dressler's dream is attainable in the novel "Martin Dressler: The Tale of and American Dreamer"?

I don't think that Martin's interpretation of the American Dream, if it even exists, is realistic. One of the themes of the novel is that emptiness lies behind the each corner that Martin turns in his quest for attaining the riches and success that he thinks will be so fulfilling. 

What do you think holds him back from finding that fulfillment? 

I think because the fulfillment of material pursuits is largely an empty one regardless if Martin achieved it or not.