No, there are supposed to be checks and balances in place to prevent one man from breaking the system. Take for example the POTUS. Trump is about as bad as a president can be. However, if the rest of government was functioning properly, this wouldn't matter. The same thing is true for the Senate. If the senate was functioning properly, McConnell wouldn't be the Majority Leader the way he is behaving. The reason this doesn't happen is because its not just one person, but it is a group representing a minority of this country, and they recognize that the only way for them to protect their power is to give unconditional support to McConnell, who similarly gives unconditional support to Trump.
The reason they are able to get away with this is the very topic of this thread. Because the Senate gives far to much representation and power to a minority group. And the impacts of this reach far beyond small states being able to simply protect themselves from larger states. They don't use their power to protect their own states, they use that power to protect their political party. Particularly where the senate is responsible for confirming judges, it allows low population states to control not just the Senate, but to a large degree the judiciary. In a addition, these low population states are able to stall basically any legislation, regardless of its relevancy to their state. As has been repeatedly pointed out, allowing any system that would permit 17% of the population to have the ability to completely shutdown any federal legislation is insane.
If the primary purpose of the senate is to allow low population states to protect themselves from large population states, then lets remove their ability to influence national policy unless they can demonstrate a direct, unique impact on their state. Lets remove from them their ability to influence the judiciary. If we are going to give them that level of representation, then lets significantly diminish their power to shut down the ability of the government to work for the country. Or, a much simpler solution, lets simply diminish the extent of the imbalance in their representation.
I'm not arguing that the concept of the senate is bad. I agree that their should be some checks in place for low population areas to be able to have some meaningful input. The only problem is the degree right now. Surely you would agree that if we had 26 states with 2 people in each state, it would be nonsense to permit those states to have equal representation in the senate to the other 24 with hundreds of millions of people, thus giving those 52 people the power to shutdown the governments ability to legislate. I realize this is extreme hyperbole, and that obviously they wouldn't form states with only 2 people, but I use it to simply illustrate that there is obviously some point of population disparity where equal representation for each state in the senate becomes irrational. I would argue we are well beyond that point right now.