If there is a group of people who want to keep BTC down, this seems like an easy way to do it
nothing about it is easy.
when things are normal, to spam attack the network and increase the number to this much you will need to spend a lot of money which will increase every minute because of fees. which means such attacks can not be kept up.
in case of what is happening right now, you need to create an incentive for miner to stop mining bitcoin. that needs a pump in bitcoin cash and a lower difficulty. this attack can't be repeated too often and won't last long because you can't keep a pumped price up and also you can not keep the difficulty down, it will be fixed at some point.
