"... A configuration in which the vast majority of users sync lightweight clients to more powerful backbone nodes is capable of scaling to millions of users and

"... A configuration in which the vast majority of users sync lightweight clients to more powerful backbone nodes is capable of scaling to millions of users and tens of thousands of transactions per second. [PayPal] handles around 4 million transactions per day for an average of 46 tps or a probably peak rate of 100 tps. " https://en.bitcoin.it/wiki/Scalability https://en.bitcoin.it/wiki/Scalability When Dogecoin approaches Paypal's transactions per second an engineering solution will have to be found.