Based on earlier comments by their founder, I imagine it's only a matter of time before they compete directly with credit cards using NFC. He's suggested that their goal is to compete directly with credit card companies like Visa.
Dwolla is currently making most of their revenue and customers from large landlords on rent payments. If Dwolla can produce an NFC badge or keychain (until NFC catches on in more phones) and can somehow become synonymous with NFC payments before the credit cards become big there, then I can see a huge market opening up for them. Vendors hate transaction fees and customers love convenience.
Dwolla is currently making most of their revenue and customers from large landlords on rent payments. If Dwolla can produce an NFC badge or keychain (until NFC catches on in more phones) and can somehow become synonymous with NFC payments before the credit cards become big there, then I can see a huge market opening up for them. Vendors hate transaction fees and customers love convenience.