The Internet used to have laughably low speed as well. Are you old enough to have used a dial-up modem?
You are right that 4 tx/s is too low in the long-run. But people are innovating: DAG networks like Nano, BTC's Lightning Network, Ethereum's Plasma and sharding, etc.
Maybe those ideas will work, maybe they won't, but very smart people like Vitalik believe they will work, and they are putting serious time and effort into them. Happily, Lightning Network, sharding and other proposals are making serious pushes forward this year as a top priority, so we don't need to argue -- we'll soon see how well these upgrades work in practice.
You are right that 4 tx/s is too low in the long-run. But people are innovating: DAG networks like Nano, BTC's Lightning Network, Ethereum's Plasma and sharding, etc.
Maybe those ideas will work, maybe they won't, but very smart people like Vitalik believe they will work, and they are putting serious time and effort into them. Happily, Lightning Network, sharding and other proposals are making serious pushes forward this year as a top priority, so we don't need to argue -- we'll soon see how well these upgrades work in practice.