You're right of course, and I would like to have RI merged with MA and thus eliminate two liberal Senators.
But unfortunately that won't ever happen, and like it or not (I don't) RI voters have just as much power in the US Senate as FL or any one of the other heavily populated states. That's because our form of government was designed as a Constitutional Republic rather than a simple democracy, and a true democracy is one of the worst forms of government the founders could have chosen.
Without messing with the constitution, FL is still a more important state than RI. Its senators' actions influence millions of people who send a lot of other politicians to office. The system we place in power attempts to become self-perpetuating. Also, Flordida's prosperity makes it a source of enormous influence. Its location makes it geopolitically significant.