On the point of this movie failing because no one has heard of ant-man. Anyone remember a little movie called the Incredibles? No one had heard of them before hand because they were MADE for the movie, and that grossed over $600 million worldwide. Hell, not many people heard of Ghost Rider and that was a success as well.
Another thing though, and It's inevitable that this has been discussed before, but would anyone be fine with this being a comedy? I know most people get really defensive and say "blah blah blah they need to make a very serious movie and stay very very true to the character" but that's why I feel Edgar Wright is perfect:
Look at Shaun of the Dead for instance, Even though it's a comedy, it's STILL a great zombie film, probably one of the best. Then there's Hot Fuzz which completely lampoons all the "buddy cop" cliche's but is still a good buddy cop movie. Edgar Wright has the uncanny ability of being able to make fun of his subject material and at the same time treat it very seriously, and in that way I can see Ant-Man being a very successful movie. Not stupid successful like $900 billion world wide or anything, but I think people are so spoiled now by all the epic blockbusters that they think every movie has to make insane amounts of money to be considered a success. Edgar Wright could and likely will make this film for under $100 million, therefor it won't need to make a ridiculous amount to be considered successful.