The whole idea behind starting the Ethereum project if you go back and watch some of Vitalik's original presentations was to garner huge amounts of network effect into a "common bucket" so that even small blockchain assets could benefit from huge underlying hashpower and associated security, reliability track record and general viability as a Bitcoin 2.0 'safe' asset or application.
Whoever gets there first only has to not make any big mistakes to hold onto that momentum because it's a self propelling cycle as we're already starting to see. Price rises --> more miners arrive --> more developers arrive --> blockchain assets & services accrue value --> consolidates network effect --> price rises.
I don't think Ethereum is "money" the way pure currencies like Bitcoin and its specialised alt-clones are. But I think it can still reach a marketcap as a stock who's value gets reflected in the underlying value of the blockchain tokens.
What does a Bank or MSFT have to gain by buying ether ? Any technology of value can be stolen by them and forked as its open source. If Ethereum had 50 million users that would be a completely different story and it may make sense to buy ETH, but there are less than 25k Eth users which a PoS fork and boostrapping MSFT current community would lead to a much larger and much more secure userbase than ETHereum.
Do a little research into how these companies operate. They make cutthroat , smart business decisions .
Right now MSFT is embracing the Ethereum technology, just like banks are embracing blockchain technology. IF enough intrest develops around Dapps than than expect a fork with MSFT issuing their own fuel and adding their own patents to the tech so they can control the technology (the extend stage), than they will continue not to buy eth fuel , and make it ethereum obsolete by removing compatibility or making it less useful deliberately in the Extinguish stage.
This isn't a slight because I'm a Bitcoin maximalist. I welcome the idea of competing alts and would lay the same claims to any bitcoiner who had the foolish idea that banks and governments would willingly adopt Bitcoin instead of create their own private blockchain.
This is just reality... I urge you to go ahead and buy a few ether if you want to play around with the tech or test a dapp to learn or develop your skillset... but investing in it because you think a bank or MSFT is going to be buying ETh is misguided and foolish.