Visa, 20,000 transactions/sec capability. The current Cyptocurrency will never be able to accommodate current large scale transactions. Bitcoin I would say has a ceiling which it will not be able to go beyond. It was a great proof of concept for blockchain technology for verification not using a third party, that is if you consider the actual verification of transactions per block by 51% of the network not third party. Buyer - Seller - verification of transaction (Financial institution or Blockchain network).not sure what pool or exchange you are using, but you are getting raped if you are paying that. When I cash out or move BTC around I'm only having to pay like $3 or something to move 1/2 a grand. which is literally 0.6%
Transfers on the bitcoin network are pretty slow, I damn sure don't use BTC if it's a time sensitive transaction if there's a rush on the network things go even slower. The one thing I got into recently that impressed the hell out of me was Ripple XRP transactions.
Just for fun:
Bitcoin network currently averages 3-5 transactions per second, Ethereum: 20 TPS, Paypal: 193 TPS, Ripple has the capacity for ~1000 TPS sustained. sending money anywhere in the world in 15 seconds without going through 3 middlemen is awesome.
As for waste of energy - would that include watching TV, listening to music, playing games etc.? Which in most cases cost money vice making money. Anyways the argument goes not the door anyways with ethereum, this is very much unique - besides just guessing the magic number to confirm the block of transactions, ethereum is a platform for distributed applications which can do real useful productive work while confirming transactions. So in essence much more productive in scope for every kilowatt of energy used over a typical TV or audio system.