Why can't you? In my experience, scaling Kafka was far easier than scaling our RabbitMQ cluster. We started running into issues when our RabbitMQ cluster hit 25k TPS, our Kafka cluster of equivalent resources didn't break a sweat at 500k TPS.
What sort of systems do you work on to require this kind of traffic volume? I've worked on one project that I'd consider relatively high volume (UK Post Office Horizon Online) and we were only targeting 500 TPS.
