Normally I would say that all that matters for cryptocurrency to be used as payment is that both parties of a TX are willing to accept it. In the case of Gucci, I would question the choice of DOGE as one of the altcoins accepted for payment purely from an image or branding standpoint. Had it been, say, Sharper Image, I think DOGE would be OK there. However, I have to remember that many celebrities and famous people own DOGE and patronize Gucci.
The only use case for an altcoin which matters in the end is its use as money to be used. As long as people are willing to accept it as payment for a product or service, that's all that really needs to take place. So altcoins need to be front-and-center in the effort to gain acceptance as money to be used (including HIVE and HBD).
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