The good news is that this attorney was caught and prosecuted. He has admitted his guilt and faces a potentially long prison sentence for his crimes. This is good because elderly clients should be able to trust that their attorneys will not attempt to cheat them out of their money.
Estate attorneys who would do this type of thing are a small minority. Elderly people, however, should be aware that these things happen and they should make sure they hire attorneys who are trustworthy.
Reference: The United States Attorney's Office Northern District of New York (June 11, 2018) "Albany Attorney Admits to Stealing from Elderly Clients in $11.8 Million Estate Fraud."