Comment 13 for bug 536571

I'm reopening this to Incomplete in order for more people to see it and perhaps contribute to the discussion.

I haven't thought this through yet so I'm still undecided. Though I'd like to comment that I always assumed even the barbarian taverns lost their ability to produce lower food wares. This seems to be the case with most upgradable buildings, so it simply did not occur to me this would be the case.