It would make sense to run them for the benefit of the Irish economy by stocking those pubs with beer, cider and spirits made in Ireland. Not necessarily craft beer, but certainly beer brewed here.
However, running 200 London pubs would require a lot of expertise. Then you also have to consider how the British government and public (read newspapers) would react to the Irish government doing this.
Much less trouble just to sell them and take what money they can get, which I doubt will cover the outstanding debt.