Pretty irrelevant what the founders had in mind when they set up the system. At that point the federal government did... basically nothing? There was no federal income tax, no social security, no federal highways, no FAA, no environmental laws (or knowledge off. Could the founders even consider that senators from a tiny state could block laws against their toxic waste running into a huge one? Is it fair that they have equal say?). The people have decided that the federal government shall do many many things, but that doesn't really work with "independent states". Americans are trying to have it both ways, with states doing whatever they want, but people (both parties) want the federal government to do lots of things.
edit: also there is absolutely zero chance this will change, as it would only mean one party gains more power while the other loses it. There is no way to compromise this where both get someting (at least not that I see. If it is I'd love to hear it)