Let us do some calculations, I love Maths.
BCH hashrate =4.8E (Current and highest in 12 months)
BSV hashrate =3.7E (Current and highest in 12 months)
BTC hashrate =106.2E (Current and NOT highest)
4.8+3.7= 8.5E
8.5E is 8% of 106.2E
In the grand scheme of things, nobody actually mines those two coins, so even if they were to vanish for whatever reason, and every gear pointed towards those coins joins the Bitcoin blockchain, it's just a matter of 8% added to the network, 106.2E + 8.5E = 114.7E, Bitcoin has done higher than that just a month ago.
So let's assume the following, those coin's profitably drops by half while their prices do nothing, half the hashrate migrates to BTC, and then what? I really see nothing coming up in 60 days, it's the 87 days that actually matter.