Most rigs use Intel CPUs, there won't be 11 KH/s per rig. Even if they all were AMD AM4 boards, have you tried to buy 3900X recently? Mission impossible. But I do think hashrate will go up to 1 GH/s after the fork.
There are many more CPUs running at a current moment rather than GPUs. So if they are all turned on at the same time and pointed towards Monero, the hash will be at a crazy number.
It will also be easier to create a miner for it to run in FPGA because of the compatibility with CPU mining. So, that's that.
Still, I hope early adopters can crunch some hashes and earn a good number of coins before it hits the fan.