There is currently a technology out there right now that addresses all the problems inherent in profile/passwords, i.e. they get shared, lost, site must hold a secret for user. SQRL (https://www.grc.com/sqrl/sqrl.htm) handles all that and more so why not just implement that tech? Admittedly there is going to be some cost but when/if it scales up it will the answer to all of those questions.
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There is currently a technology out there right now that addresses all the problems inherent in profile/passwords, i.e. they get shared, lost, site must hold a secret for user. SQRL (https://www.grc.com/sqrl/sqrl.htm) handles all that and more so why not just implement that tech? Admittedly there is going to be some cost but when/if it scales up it will the answer to all of those questions.