Bitcoin cannot provide loans.
We can Replace the loans model if the same efforts of decentralized due diligence and p2peer crowdfunding and an Equally held level of accountability for diligence with guaranteed minimum collateral and a convertible opt-out option - B-corps utilizing sidechains to allow users to work together
can be possible.
Bitcoin cannot provide investments.
Holding
BTC is an investment - using and participating in the economies around cryptocurrency in and of themselves are investing in
BTC and related technology
Bitcoin cannot provide estate security.
I would have to argue that 'neither do banks' have the power to protect your estate security any more than
BTC would if properly secured - although the more I think about it, you're probably more correct - for now because it is much easier to secure regular funds as an average user than it is as a complex user who has things well figured out and trained. (make a certain type of special decryption that requires humans as well as proof of death as well as proof of progeny and Bitcoin will supercede bank regulations involving beneficiaries)