It really was to be honest. Senators were charged to speak for the concerns of each respective state in the same regard as representatives speaking for concerns of the citizens. Turning the senate vote into a popularity contest basically makes senators 6 yr reps. The 6 yr term was because states do not change, where as the 2yr term is tied to the population, it's concerns, and population evaluation of said reps i.e. are you representing us and following through on your responsibilities.

Same thing goes for removing the property ownership for voters, people with virtually no skin in the game voting for things that do not affect them screws the rest over in too many ways to list.