All his future earnings would be considered if there were a divorce, and he would be liable for her care as her husband and next-of-kin. He has to protect himself from that which could be one of the reasons he doesn't go for a divorce.
The longer this drags out, the more I don't think THAT is the issue. Oh, I think money is an important element, but I think as far as legal access to Michael's money, her parents would happily sign away any claim to it if he would just go away. I think Michael's financial "interests" are more deceptive.
It appears as if he might be caching money under false business names, or manipulating the spelling of names to bury financial information. That is speculation based on some previous posts. There is also the possiblity that Felos could be involved in some investment scheme with Schiavo using Terri's money, and if someone else accesses the bank records, this could be discovered. And finally, there is the book Felos is writing that will be virtually worthless as long as Terri is alive. And who knows if he has either given, or promised Michael proceeds from it...not to mention the possibility that Michael is planning to, or has already, sold the rights to her story...again a potentially huge financial loss if Terri lives. And then there could be a problem if records are opened, that he defrauded Medicaid/Medicare and/or Social Security. So on the financial front, he could have serious problems, the least of which would be alimony and shared property or the initial malpractice award.
I think graymatter is right in saying that he has an even bigger problem on another front, though. If Terri is out from under his control, medical records could be opened and I think the husband from hell is VERY afraid of what will happen to him and the nice, cushy new fantasy life he is living, should that occur. I'm expecting to see some very bizarre moves of desperation on the HINO's part in the near future. It may be that Greer has already cut and run to save his own hide. What I am watching is what Felos does at this point. If Michael starts looking like a loser and is being defeated in court, Felos, with his delusional mindset, may no longer be able to afford to be associated with him. If Felos cuts and runs, we will KNOW we won.