Talk about piling on. Just as payments industry players were absorbing eBay’s eye-popping $945 billion acquisition of Bill Me Later this week, Celent unleashed a report Tuesday predicting that alternative e-commerce payment schemes threaten to take away up to $1.7 billion in potential transactions from card brands and issuers by 2015.

PayPal, Bill Me Later, Google Checkout and Amazon Payments are the lead mercenaries who will diminish credit cards to under 50 percent of total online transaction volume within two years, compared to more than 60 percent in 2005. Even with rising debit card usage, all card-based volume will be around 70 percent in 2010, according to Celent (down from nearly 80 percent currently).

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