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Whatever eventually displaces JMeter has got to start somewhere.

Can you even 'replace' an open-source soln with a closed-source one?

If so, there are already many better "replacements" like loadrunner:

I think extensible open-source load testing tools like https://k6.io and https://locust.io are already replacing JMeter.

Yeah locust is great - used it for fairly complex loadtesting of a blockchain and enjoyed it. Gatling is another good one if you like Scala.