tl;dr: Don't forget NFTs!
I see something very similar. Blockchain, as a method of handling data, simply solves too many problems to not be integrated into our handling of data, as a society.
Where I disagree is the idea that the alts will die away. I think because of how transferrable liquidity is between coins, there's very little reason not to add new tokens: as you say, for new companies, new neighborhoods, etc.
What will change is the disconnect of these tokens from the established tokens, but we've already kind of seen that: many new tokens run on Ether.
The implication of this I think we're going to see explored this year: how easy it now is to take something non-fungible but tokenized and derive a market value that can be understood by two individuals, buying and selling the thing, right there.
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