Being accepted internationally is not a proprietary technology. It's not something that ONLY PayPal can do. It happens to be something ONLY PayPal does at this moment. But honestly, give Square or Dwolla 7 years and they'll jump on the international bandwagon as well. The benefits are too numerous for anyone in that space to ignore international payments.
Also, BitCoin. I wouldn't even consider it an option for myself for so many reasons but BitCoin is truly international and the only thing that comes close to PayPal at the moment. I'd rather not have to ask the other party to spend 6 and a half hours reading and understand exactly what bitcoin is, how it works, and weather or not they can trust it. Then spending 7 days moving money from Bank Accounts to Dwolla to MtGox. But it is an option. Especially for large sums of money IF it's from people you trust and IF they know how bitcoin works. But that's too many ifs.
Also, BitCoin. I wouldn't even consider it an option for myself for so many reasons but BitCoin is truly international and the only thing that comes close to PayPal at the moment. I'd rather not have to ask the other party to spend 6 and a half hours reading and understand exactly what bitcoin is, how it works, and weather or not they can trust it. Then spending 7 days moving money from Bank Accounts to Dwolla to MtGox. But it is an option. Especially for large sums of money IF it's from people you trust and IF they know how bitcoin works. But that's too many ifs.