Saying, "Oh, well.. geez $1 million for 1 bitcoin, that just doesn't seem possible," That's because you are looking at it all wrong. If Bitcoin becomes a standard alternative to operating in dollars for "Brick&mortar" as well as "Online businesses," You can be your a$$, you will see a half trillion, to trillion dollar market or more.
This I agree, but $1 million for 1 bitcoin will be possible if there will be no reason to convert to dollars anymore.
If there is no reason to convert to dollar then dollar will slowly die at some point in the far future.