It's limbs, which are still useful,
Ah, but you didn't say "limb"; you said "leg"
One the problems of evolution (trial and error) on a grand scale would be, for example, a leg would become useless long before it became a useful wing.
So, you now agree that a useless leg may still be a useful limb.
Hence, no bar to eventually becoming a wing.
are no where close becoming wings.
Irrelevant. If non-leg limbs can be useful without becoming wings, they can also be useful in the interim between being legs and being wings. Whether or not they ever become wings, legs which no longer function as legs are not a problem as you first claimed.
They just have to function in some useful capacity.
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