I don't really see any alternative (yet) that can supply the functionality that the customers and business actually want, for example I like that I can add load

I don't really see any alternative (yet) that can supply the functionality that the customers and business actually want, for example I like that I can add loads of things into a basket and then sort everything out when I'm ready to buy etc, and businesses probably like the fact they can ship everything in one big item and save on shipping. There's a few other methods out there like one click purchases and subscription based models but these are filling a very specific requirement and don't really fit most models.