As a person addicted to Coca-Cola Zero (US translation: diet coke), this is just sad.
I would love to have home restaurant-like dispenser, or a Soda Stream syrup but for obvious profit reasons they don't offer that.
This would reduce my plastic bottle consumption by 100% or about 30-60 large bottles per month (not even counting the shipping footprint of what is essentially is 99% water). Sure, there are generic syrups or even Pepsi Max syrups, but it's just not the same for me.
That's what happens when profits are put on top of cost for Earth as a whole.
Sure I probably could switch to something else but why should I make this effort?