The third generation network should be able to solve the throughput problem? The cryptocurrency you're talking about is the scope of the third generation block chain, right?
Aside of crypto regulation and attack resistance networks, this transaction speed and scalability is the most issue in crypto market today.
transaction speed is the most advancement for every blockchain network that will attract more investors and would be the best reason to used as primary cryptocurrency.
although there are already blockchain networks are already offering this speed but it requires proof to handle network stress and evaluate the transaction speed.