It makes next to no difference. The public are interested in Morrissey the controversial figure, and in the Smiths songs - they are not interested in him as a modern-day musical act. Watch how his version of Satellite of Love (released in the next week or two) fails to dent the charts.
Go to the Compare My Radio site
http://comparemyradio.com/ type in Morrissey and see how many times his songs are being played. About 60 per month - its lowest ever. Two years ago he was getting double that (and there were no new songs).
Sadly, the hype surrounding Autobiography counts for nothing in terms of attracting a better album deal.