It's not surprising, and as wxwax rightly points out, it's not a significant change from the current situation. California has almost 70 times the population of Wyoming, but each has two senators. Like the electoral college, it is enshrined in the Constitution and is virtually impossible to change--those states with disproportionate influence would never voluntarily give it up, thus making ratification out of the question.
But at least for now, I don't think it's the most important threat to democracy that America faces. Public policy frequently diverges from the popular will. National polling shows broad support for sensible gun control, better healthcare delivery, affordable education, protection of DACA participants, and a host of other issues that have little chance of being enacted.
The real problem is the overwhelming influence of oligarchic wealth and organized special interests. Political scientists Martin Gilens and Benjamin Page did a landmark empirical study of what truly influences government policy. Their conclusion was:
Multivariate analysis indicates that economic elites and organized groups representing business interests have substantial independent impacts on U.S. government policy, while average citizens and mass-based interest groups have little or no independent influence. (emphasis added)
Note that the study was based on data collected before the Citizens United ruling of 2010, so presumably things have only gotten worse since. A good overview of the study is here; details here.
Structural factors do matter, but for the foreseeable future I think the electoral college is a larger problem than the Senate. There is a slight chance that the National Popular Vote Interstate Compact will attain the needed support to effectively eliminate the electoral college without changing the Constitution, but it still has a ways to go. It probably won't happen till a Democrat wins the presidency while losing the popular vote. I'm not holding my breath. In the meantime, the sad truth is that like most other countries in history, the US is governed by the Golden Rule: those with the gold make the rules. Disproportionate representation in the Senate is merely a footnote.