Blockchain is not a skill. It is a f****** global shared ledger of Bitcoin transactions

they will never learn

Blockchain isn't skill, blockchain is technology and skills are following: Public Speaking, Communication, Writing, Creative thinking and etc. Being a blockchain developer is really top profession as for now because lately there was huge demand on implementing of blockchain technologies. There were a lot of news on websites like: Newborn registry in Brasil via blockchain technologies, Some contracts with Bitfury regarding to BC integration, HSBC's huge interest in BC technologies, there are even more things. So demand on integration of blockchain technologies skyrockets daily while blockchain developers remain few, this is huge opportunity for people who are in information technologies to move on it and develop further.

You're right. Blockchain is not a skill, all the same, we meant about persons, who are in any way connected to Blockchain - e.g. Developers, Marketers, Lawyers, etc.

This surprises me. The only stuff that makes money in 'blockchain' are exchanges and conning VC investors into throwing money at any old shite. I would've expected it to have gone quiet for now at least.

If IT burns through qualifications at a furious pace then 'blockchain' has only just gotten started. What'll be put into actual use in a few years will likely bear zero resemblance to what they're playing with now.

The only area of 'blockchain' I'd be specialising in at present is bankruptcies.

Because the OP just wants to boost his post count,I guess.
Blockchain technology is the next big step for the high tech world (after cloud computing and IoT).
I think that this is going to be the tech revolution "chain"-cloud computing>internet of things(IoT)>blcokchain technology>Quantum computing>Artificial intelligence(AI).

Bloclchain has the power to disrupt many sectors and industries. In most of the industries, the bloclchain powered products are there but still in testing phase. Therefore, for r&d companies need labour force with bloclchain knowledge.
Bloclchain is an emerging technology which solves the very important issue of today's world which is data privacy. So, the important and relevance is natural to go up.

i think Artificial intelligence is the hardest programing skill after data scientist.
of course blockchain is hard skill but if you know programing, its more difficult to create AI than create our own blockchain.

today the source code and learning platform of blockchain is very easy to acces and we can forking from other people too.

Just to contextualize better the terms of the survey, Linkedin considers a Soft Skill and Hard Skill as:
Often an infographic without context seems out of line, and terminology in this case is subject to debate (until we bring fort the intended supporting definition).

What’s important to note is the following:
As I interpret it, the output is not based solely on the number of demands for a given skill, but rather in contrast to the number of supplies. If that is so, a specific skill with 100k demand and 100k supply would yield a ratio of 0, and a skill with 10k demand and 2k supply will have a ratio of 5. The latter, despite having less demand in absolute terms, has more demand in relative terms (demand over supply).

See: https://business.linkedin.com/talent-solutions/blog/trends-and-research/2020/most-in-demand-hard-and-soft-skills

Blockchain is the biggest innovation of the time. Due to its revolutionary and growing nature, many people are getting attracted to it. In this way if we look at the skills of people who are in any way connected to blockchain in this crypto market they are very important. In near future, with the further growth of blockchain technology people having the skills in this technology will be more valued.