And, frankly, my heart sank when I saw that this post met with some approval. My goal is to make a post that offends everyone. Every single person who reads it is offended. So I try and I fail. I will try harder next time. Eventually, that day will come.
Now, let's focus on our disagreements. With regards to your last point, you appear to misunderstand who is the plantation owner and who is delegated the job of whipping the boys into shape. You don't really think Boehner and Cantor are the masters, do you?
The gap you reference will simply be filled with something else to take the place of seniority. Some of these hayseeds who have been swept into office would fare worse in comparison to a fellow neophyte like your Rubio character. Seniority is about all they have in the present system. They would be even more susceptible to pressures and less likely to buck the conventional wisdom within the party. "Stars" like Marco would have disproportionate influence versus Senator Rube Myers from Iowa. At least in the present system, old Rube can accumulate seniority and occasionally steer policy in a different direction.