I think that the proportion of costs attributable to flight crew is generally overestimated. I don't have any specific figures, but I think it's less than 5% of total costs for the large aircraft as operated by BA.
30% of 5% is less than 2%, and this increase in opereating costs is hardly going to have the dire consequences predicted by some posters here.
If the pay is'nt right, the industry will in the long term not attract the right calibre of people. I think that most passengers would gladly pay an extra 2% to have the right calibre of people at the sharp end.