Guest
I think it's absolutely fine if Migros doesn't sell alcohol or tobacco. As far as I'm concerned, the branded goods area could also be thinned out.
An article in 20 Min http://www.20min.ch/finance/news/story/Migros-will-gegen-4000-Artikel-streichen-25068789 also points out the problem of Migros selling too many items.
But if it were only about profit, 20% of the sales area would quickly be reserved for wine and spirits, as we know it from Denner. That would be a shame.