Bitcoin is simple, cheap, instant, and easy. If sending bitcoin to an address need more than an hour, it is not an instant payment.
No bitcoin is not going to destroy the internet and online payment system but its just will add simplicity and add an option for those users who cant afford bank and online payment through other mode of payment. like me who use to buy domains with bitcoin because I don't have a credit card and debit card of VISA so its better for to pay with bitcoin. it's how we look and use certain technology that makes its quality good or bad.