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 He is technically correct. 
40 bytes OP_RETURN should be more than enough for any and all blockchain arbitrary data storage needs. 
Don't let lazy programmers and greedy hype riders tell you otherwise.  
 Or the boy that cried "censorship", as in this case. 
(I say this with love, guys, don't take it personal, please.)  
 Yeah I don't think the bitcoin blockchain is meant to be a data hoarding NAS either.  
 I think the valuable anchor/notary use cases will fix this without any intervention.

But on the other side, maybe a campaign to hardfork (change rules in a backwards incompatible way) to put limits on witness sizes.

The benefits to miners at the expense of all other uses should be obvious. The legacy of big blocker attacks continues.