What do most financial products provide to society that's new and useful?
If you want to throw up your hands and declare this all a waste of time, feel free. You'll have lots of company, and for good reason, but setting some arbitrarily high goal such as "providing something new and useful to society" just makes it sound like you've got an axe to grind.
There's plenty of things about Ethereum (and blockchain exchanges and how they are used and hyped) to criticize legitimately, but this doesn't seem to be one of them.
In reality, you would be very hard pressed to get 51% of all global wealth to agree on anything. Today, it is pockets of ~1% wealth screwing over their regional 0.00001% constituents.
Again, what is it that ETH provides society that's new and useful?