Of course, not everyone thinks that the Electoral College should be abolished. There are many people who would like to keep the system that we have. However, if we do think the Electoral College should be abolished it is because it is, arguably, undemocratic.
With the system that we now have, the popular vote of the country as a whole does not count. We saw this in the 2000 election when Al Gore won the popular vote and lost the electoral vote. In addition, people in many states feel as if their votes will never count. This is the case, for example with people in Washington or in California who tend to vote Republican. Their states are so heavily Democratic that they never feel as if their votes count. The same goes for Democrats in Idaho, Utah, and most of the South.
If we were to abolish the Electoral College, things would be more democratic. Every voter would have a better chance to have their vote “count.” The person who won the most votes in the country as a whole would be elected. This is how democracy is supposed to work.