That's a personal question that only you can answer as it comes down to your definition of quality of life and also what you're willing and/or able to do for that animal (time spent caring for, financials, etc.). This goes for any animal really, not just reptiles.
My go to in determining euthanasia in any case is: "is this animal still going to be suffering 6 months to a year from now, even with medical intervention? Is there ever a chance of it being happy, content or thriving? Is this 'problem' fixable?" This sort of line of thinking makes it easier for me to determine what I consider quality of life.
Again, those are my personal guidelines for making that type of decision and there are definitely people that are going to disagree with me; I'm very critical and realistic with things like this and try to remove emotion out of the decision making process as emotions usually just complicate the reality of what needs to be done, unfortunately.
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