First of all Ethereum is not a crypto currency coin but a open source software platform. Lets get the basics straight to start with.
Will banks or technology companies experiment with, probably just like the experiment with bitcoin and other coins. If a bank ever uses the blockchain tech they will create there one coin, a la citicoin.
It's definitely a worthy investment.
Lol i still needed a good laugh today. Ethereum is somewhat comparable with "Red Hat Linux" on blockchain tech. Yeh you may can build on it but open source software is not a investment to expect financial return. It maybe is a investment on ethical ground.
On top of it a CEO with a track-record of 5 started and failed companies is not the most convincing argument for a worthy investment on his next attempt.