I definitely believe in the underlying tech. I also believe that 2018 will be the year of privacy coins, e.g. Monero, Zcash, Deeponion. If we're going to see a migration of data storage through blockchain, we must have full privacy of all transactions.

To give you a good example, I have pasted a part of the DeepOnion whitepaper below:

An empirical demonstration of this ability to track
the blockchain is visualised through the recent Wannacry
ransomware [10] outbreak that infected millions
of computer systems throughout the world. The ransom
required to decrypt an infected machine’s files was requested
in BTC and the wallet address was therefore
made public, thus available for tracking as well. In
the following months, it became increasingly difficult
for the group responsible to exchange their BTC for
FIAT as every time the BTC moved to another wallet
it could be tracked within the blockchain. Whilst many
may argue that this is a positive feature given that
it was a criminal act, consider the following perfectly
legal scenario. Imagine a negotiating position during a
tender agreement. If a competitor was able to track your
financial investments by obtaining a list of your suppliers
and contractors through blockchain exploration,
this would provide valuable insight into your finances
and undermine your negotiating position. This could
lead to outbidding, corporate takeover as well as a
full disclosure of all previous investments and business
relations. This would be catastrophic for most businesses
and probably one of the key reasons preventing BTC not
being adopted by major institutions where privacy is a
fundamental principle in financial operations (something
that is actually mandated in numerous jurisdictions).
It is clear, therefore, that the level of privacy that
BTC affords to its users is wholly inadequate for mass
adoption. Therefore, it is glaringly obvious that the often
quoted ”anonymous” nature of BTC is indeed a fallacy.

Anonymity is another area of weakness for BTC with
node traffic being sent in an unencrypted fashion. BTC’s
peer addresses are clearly visible IP presenting a prime
opportunity for targeted attacks and consequently network
interruption. This information is trivially obtained
through the ‘getpeerinfo‘ command in any of the freely
available BTC wallets. Not only is it unsecure to involuntarily
disclose the public IP address of your computer
wallet without adequate perimeter defences (Adaptive
Security Appliances etc), it is considered bad practice.
Potential risks include the ability to be able to link a
user’s wallet address to its IP, further disclosing the
identity of the coin holder and possibly resulting in
a more sophisticated, intelligence-based attack. Thus,
protecting the wallet client’s IP address is an imperative
action in protecting your identity and safe-guarding your
financial a ssets. These risks are specifically mitigated
by DeepOnion’s implementation of anonymous TOR IP
addresses.