Why would you say that? People make provisions for all kinds of stuff - furniture, photo collections, dogs, cats, bonsai trees...you name it. Why let a lifetime of work to down the drain?
Somebody has to deal with it if you leave this life with an up & running tank. Why not save your loved ones and/or executors the hassle and potentially save some innocent animals at the same time? A valuable collection could add some cash for your estate too in some cases.
But yea, just toss the ant farm.