Well, ya gotta consider the demand or lack thereof in having bottles like that. Players can only comfortably carry so much paint and be able to move effectively, plus there's the cost of throwing it. Back players already carry 88 or 114 4500's, and shrinking the size of the bottle isn't that much of an issue for their position. Front players just don't carry more paint than a 68 or 45 4500 can can shoot because they've gotta move and stay tucked, so that issue disappears rather quickly too. How much lighter do you need than a carbon fiber 68 or 45/45? Even the most dwarfish of people can handle that, and nothing made today sucks down air badly enough for them to need more for what they do.
Did we need 4500? Yep. Do we need 5000? No, but it's there. More than that? In my opinion no.