Only a moron would take that job -- if they want to actually manage a club. If they want a nice payout when they get fired, make sure your contract is to your liking and take the job.
I think that Hiddink is the only coach that would have a chance at meeting Roman's expectations other than Mourinho and Ferguson. Mourinho is out of course and can't see Ferguson managing another club before retirement. I personally think that Hiddink is too stubborn in wanting to do things his own way (much like SAF & Mourinho) to take the job unless such power was written directly into the contract in iron clad terms.
-Removed-i doubt O'Neil would take the job, he likes to make his own decisions and is he not doing alright with Villa anyway, while at Celtic he was a legend and a folk hero! it seems to be a Russian/Eastern mentality that those who own the clubs think that they can make better decisions than the people they hire, Romanov tried it at Hearts with George Burley and Burley told him where to get off, they were unbeaten up until that point and after he left went spiraling downwards!