Only a tiny amount of plastic bottles are reused or even made to be reusable. There's no way to even make a dent in the horrendous waste of bottled beverages without drastically reducing the amount of single use plastic bottles produced.
"The plastics industry" is a lot bigger than just disposable water bottles. Not to say you should use disposable bottles. According to the UN, 36% of plastics were used in packaging (which includes packaging of beverages, ie disposable water bottles).