If we are the new wealthy elite, why don't "we" open up some BTC friendly banks?
Why we need middle-men? Exchanges are OK. But I am against the banks. If you want to store the coins, you have wallets. If you want to buy the stocks, then you have stock exchanges such as Cryptostocks. If you want to exchange the coins to fiat, then you have Bitcoin-exchanges such as Bitstamp and BTC-E. Then why we need the banks?
Banks are not inherently evil. They just get that way when there is a centralized fiat currency that they either create, control, or are able to manipulate in a major way.
The business of a legitimate bank is to get money loaned out on a risk appropriate basis, and make money for their depositors via interest. Doing this fosters development and adoption. There are a great many reasons why banking would be very good for bitcoin and other cryptos.
So long as said banks are well capitalized, properly insured, and transparent in their business, they will be a positive force for bitcoin. If they are allowed to operate in the dark and without restriction like the modern "banks", then they will be a huge liability.
To give a small illustration as to why a bank is good, think on this: You take a portion of your bitcoin out of your wallet, where it's safe but doing nothing, and invest it in a bank's Certificate of Deposit for a period of, let's say, six months at 10 percent per annum, compounded daily. You can't touch that money for six months or you lose the accrued interest.
The bank, then, lends it out at 20 percent. They make a profit, and share half of it with you. At the end of the six months, you are about six percent richer (off the top of my head, I didn't actually calculate this), some slob with a business idea has put your coin to work in advancing bitcoin as a payment platform, thus raising the value of your coins, making you richer yet.
This same bank has insurance on your deposits ( a service that also incurs fees, and thus interest for it's investors) doing much the same. This leads to a growing adoption and a growing value.
It has been done, and it will be done with bitcoin. So long as it is not "overseen" by central authorities, but rather beholden to its depositors, it's a profitable and noble endeavor.
Soon, and I can guarantee this is true, such an institution will exist. And it will drive bitcoin into the mainstream.