If you want to do a real cost-benefit here, you'll have to compare actual work on both sides, but then also weigh what you're getting.

I'm basically saying that the amount of work to build the same functionality currently in jussi, but in kong would be less simply because

1. It's lua
2. Plugin infrastructure exists for future improvements and extensions
3. Multiplexing builtin.
4. Reverse Proxy builtin
5. Throttling builtin
6. Authz/Authn builtin
7. FaaS builtin
8. Microservice awareness builtin
9. You just get so much stuff for free you don't need to build anymore and you can just concentrate on building blockchain stuff

Also, it's not just better because the work would be less, but the benefits are greater

1. Simplified infrastructure
2. More flexibility design and implementation
3. Maintained by another community (you just focus on you)

Whenever the question is "Should we reinvent the wheel?" the answer is almost always, "no".