I'm not saying it's perfect, but the Northeast has obviously had more competitive elections than any of the other regions. This is quite clearly because it has double the population of the other regions.
It's not a huge deal to me, really. But I haven't heard any good arguments against my reasoning.
It's also fairly ideologically diverse. The proposals in reducing the regions have almost always just combined the Midwest with the Pacific and the Mideast with the South. This solves almost nothing, and even for the sake of argument you were proposing merging the Mideast and Midwest and South with the Pacific, people would hate the idea, because those in the Mideast, especially, love having complete control over the region.
It would also necessitate a return to districts to continue electing the same number of Senators, which I just plainly don't see the point of.
I'm not opposed to change, but I don't like proposals that make big changes like this in trying to force people to be more competitive, which is different than the proposals I bring forward, which are more focused on encouraging certain practices or are improvements related to the governing side of the game. You can't force general competition or activity like this. That sort of stuff comes and goes on its own.