You are right about need to make very VISIBLE and PUBLIC apology for months. After 2-3 years, Bud just might be able to climb back up to some semblance of respectability. For now, I would not buy BudLight unless it was being VERY heavily discounted, and then I would not drink it in public.
Besides all the negative press about Bud Light right now, with so many choices of beer including many light beer choices, once a loyal customer realizes another beer is just as good or better than Bud Light, they will likely never come back.