Over time people are far more likely to accumulate more accounts. The longer someone has been on the net the more accounts they are likely to have. Making life difficult for this group of people doesn't seem sensible.
Note one statistic: Later, we did an analysis of the retailer's database, only to discover 45% of all customers had multiple registrations in the system, some as many as 10.
That puts the order of magnitude of people having more than one account around half. That of course doesn't mean that people have multiple Google accounts, just multiple accounts but Google is becoming increasingly pervasive being the email provider for companies, universities, organisations etc.
