It will just get worse till all the buyers are gone.
Bitcoin isn't immune to this shit.
"All the buyers" will never be gone.
I keep buying Bitcoins, once per month, in the form of receiving a (fiat denominated) paycheck in btc.
Every month I add to my savings a considerable fraction of what I get paid.
The evil manipulators can do exactly two things to me: they can cause me too add more Bitcoins to my savings each month, or they can increase the purchasing power of my savings.
Since I don't expect to need those savings for many years, I'd highly prefer the former over the latter, but I win either way.
Working for a living is so much easier than daytarding.