The Senate is, while not the whole story, a significant part of the reason the government constantly fails to do what is either the desire of the people or what's in their interests. I wouldn't lament losing the Senate.
Aren't you supporting parent's point? The senate is elected these days after all ...
The Senate was fundamentally from the start a compromise in favor of the slave-owning ogliarchy. You just have to look at free and slave states being admitted in pairs to preserve the status quo of slavery to see how that went.
The US Senate is designed to check and balance the House of Representatives. But that often puts the Congress as a whole in deadlock, meaning it can no longer balance the other two branches.
When they could get anything done they delegated a lot of power to the Executive. Which worked ok, but eventually a "unitary executive" appropriated even more power, and the Legislature is powerless to prevent it.