The ideal solution is to put CoDel in hardware where it can be cheap. FQ-CoDel would be better, but would require many times more silicon. It's probably worth it, but it's a harder proposition to sell to the ASIC designers.
Even on current hardware, anything that's currently handling packets with a CPU instead of fixed-function hardware should be able to add CoDel without sacrificing too much throughput. Home routers running SQM-style QoS run into performance problems not because of CoDel or fq_codel but because of the traffic shaping. When everything has AQM, you no longer need a traffic shaper on your home gateway router, just AQM, and the CPU requirements for that are vastly lower.
Even on current hardware, anything that's currently handling packets with a CPU instead of fixed-function hardware should be able to add CoDel without sacrificing too much throughput. Home routers running SQM-style QoS run into performance problems not because of CoDel or fq_codel but because of the traffic shaping. When everything has AQM, you no longer need a traffic shaper on your home gateway router, just AQM, and the CPU requirements for that are vastly lower.