Honestly in my experience knowing other ray keepers, most of us fall into the category of getting bored, finding something else that interest us or lose the fish before the fish every trully get to full potential.
It's one of the downside of captive fishkeeping... I have a few fish that have been with me for 7-10 years including a ray, a widebar dat and catfish and they have been in pretty much every tank size from 75 to 600 gallon (currently)