The card companies are shockingly glacial in this market. You'd think the day after Ebay and PP came online, they'd be working on an online card solution. It would have encouraged people to spend billions more on their cards and they've crushed PP in the cradle.
Hardly surprising, entrenched behemoths are always slow to innovate and resistant to change. It's just the law. Ironically, eBay and PayPal themselves now suffer from this.