shoes are worth it imo if you can afford to walk on money. I'm not there yet, so for me, shoes are not really worth it cuz I practically never wear mine. However, if you LoVe them enough then get them regardless of whether or not you'll end up using them.
I think the winter shoes will be replaced in 2-3 months by the SS collection. So if you meant "by the end of winter" as in by the end of this calendar year, then yes, they'll still be available. However, if you meant when Spring comes in April (?), then I think they'll be gone.