I'm back with more questions.
Can Ford exist in his Euclidean form outside of the dimensions boundaries? And if so, for how long?
Another question. What did Bill wish for? We know he wished for something related to bringing Euclidea back, but not exactly what it was.
Was it related to him having to get blinded? Did him getting blinded change more than just... his eye? How come Bill hasn't burned anything down just from having panic attacks? Doesn't Clifford have to eat eventually? What does Ford feed him? How does Ford feed him?
Is it possible for Bill to unblind himself with his powers? How many of his powers does he have? How powerful is Bill still?
Ford can exist outside of Euclydia in his hexagon form as he pleases! Although whether that's a permanent ability or just something temporary the Axolotl has bestowed remains to be seen.
In essence, Bill's wish was that he'd never destroyed Euclydia. The phrasing may be vague but the intent was very specifically that his own actions were prevented. Him being fully blinded came later, although the medications and medical interventions did play a big part in the original destruction of his plane.
Bill definitely has burned things down in the past- especially during childhood. He and his parents had to relocate several times over the years after he had "accidents". But the fire alone isn't enough to destroy Euclydia; it's a combination of factors.
Clifford does have to eat! Ford has been feeding him nutrient pellets with forceps. Yum yum!
Wrt Bill "unblinding" himself... well, if he were at his full god-level powers, it would theoretically be possible. But there might be more at play there than meets the (heh) eye.