All units together, NCT sold several millions in 2021. That would suggest that a tour could also pull somewhere in the few millions at least. But somehow, looking at their last tour numbers and the venues they play, that is unlikely to be a reality. Enhyphen also sold 1M in record time, far more quickly than Blackpink managed it. But could they match BP's touring numbers (tbh they would be going on their tour with like a similar amount amount of songs BP had at the beginning of their 2018/2019 tour)?
Same goes for Aespa. They sell comparably to Twice and will be outselling them soon enough. Their numbers on BB200 are also much better than even Twice's 2020 numbers with M&M. But would their tour numbers be comparable overall, or even in the US?