Whatever his merits or lack of, is there a shred of evidence he has any desire to be President? You need a "fire in the belly" for the job in order to take the fire from the enemy, including from within your own party.
None what-so-ever. This was nothing more than a mental exercise on my part. I haven't spoken with Saxby in the past 4 years, so I have no idea what he may have in mind. I've heard nothing from or about him on the subject.
To answer your question definitively, Stefanie from his Washington office says that the Senator is not considering running "at this time".