Obviously it probably won't ever happen, I am aware of the methods that would have to be pursued to abolish it.
It doesn't change the fact that the Senate is a waste of tax dollars and space.
You wisely said federated country when stating there are no unicameral parliaments, but you choose to neglect the fact that some of the best functioning democracies in the world are unicameral. Norway, Sweden, Finland, Denmark, New Zealand, Iceland, South Korea to name a few
Again, the Senate can take a hike