If you have a trust, it is extremely important that you appoint someone responsible as the person to take over as trustee when you are no longer able to do so. It is called a “trust” for a reason. You need to appoint someone trustworthy who will look after the trust’s financial interests.
Consider the current issue surrounding the trust of Susan Strong Davis. She is 87 years old and has dementia, so she is no longer handling her affairs or her trust’s. Instead, a man named James E. Larkin whom Davis had previously appointed as co-trustee is handling everything. Larkin recently used her name to borrow millions of dollars to buy a mansion. He also donated $600,000 of her money to the Kabbalah Centre. Davis had no previous ties to the charity, but Larkin did. It is not currently known how a woman with dementia could have the capacity to direct that much money be donated to a charity that she had never previously been involved with. At this point nothing in the case is clear, but it is being looked into.
Larkin might be completely innocent of any wrongdoing. However, the issue illustrates that you need to have a trustee to succeed you who will do what you want with the trust account. You need someone you can trust.