There is something fundamental about the Once-ler and the ruin caused by his blinkered endeavor, something beyond a mere parable of environmental degradation.
There's nothing mysterious about the Once-ler now reduced to stock character No. 14-B (young man eager to prove to his unloving mother that he can be a success).
Once-ler-like, I am filled with regret for having encouraged such Gluppity-Glupp by paying for my family to see it, thus doing my small sad part in biggering the box office.