The problem Bud Light has is that their product was entirely built on branding. It is neither particularly unique nor high quality. When people left the brand and started drinking other light beers which are (arguably) only marginally better or worse, it makes it all the easier to leave Bud Light for good. If their product was unique or of particular high quality, people may have come back around... but its basically the same swill that they can get from non-tranny endorsing companies so why bother?