Would the blockchain had such an adoption without ICOs or gambling?

Blockchains provide solutions to problems that require one (or more) of the following- 1)an immutable, transparent record of transactions 2) trust between parties that don't trust each other 3) optional anonymity 4) decentralization. Any one of these use cases could be a reason to use blockchain beyond the ICO use case.

It has a variety of use cases and so yes it would still be around. ICO's are a relatively new use for blockchains and it did fine before they appeared. It's usefulness for darknetmarkets was a primary feature in its initial adoption and gambling, well where you have money you will find gamblers.

Here's an interesting use of blockchain, supply chain tracking from origin to Point of Sale: https://www.provenance.org/tracking-tuna-on-the-blockchain

Very nice, thank you

Companies already use blockchains.