Just wondering, I don't care much about cryptocurrency, but I do realize that we need cryptocurrency (as a side effect of blockchain) to make the blockchain sec

Just wondering, I don't care much about cryptocurrency, but I do realize that we need cryptocurrency (as a side effect of blockchain) to make the blockchain secure (making it an incentive to run blockchain nodes). Assuming that indeed we as humanity need blockchain (and decentralization technology) in the future, can a blockchain or any other decentralization technology work without cryptocurrency (or any other incentive for that matter)? Any thoughts?