Oh, I think I missed the wording in your post Micheal,
However, I think it is far fetched to state that a hobbyist who views themselves as committed is "self-destructive" or will lead to self-destruction.
If a hobbyist views them self as committed and truly is, then they are not a hobbyist, they are truly committed. But if a hobbyists views them self as committed and uses the excuses above, they are only saying they are committed. I think that better explains the hobbyist thing I wrote.