This is America so anything is possible, however, in entertainment the younger the better. She's been in the game for 16 years, even if she started at 18, she' already mid 30s, not sure anyone is looking to put major marketing $ behind a 30+ year old porn star to help her transition to main stream.
Look at Heather Hunter for example, sure it was a different time, but she was literally asked to stop being a Soul Train dancer because of her porn career.
I don't know Misty stone, but with her voice, she could have transitioned to broadcasting or radio very easily, she obviously couldn't or wouldn't.