The middle class is basically gone at this point, and the majority of people are either upper-middle class or lower class.
This is only true if you have some bizarre definitions that you're using. The decline of the middle class has been a few percentage points. It's certainly not "gone".
More than 50% of households in America make $25-100k. That's solidly middle-class.
25k isnt even enough to pay rent after taxes in quite a few cities where the jobs are. If you take Boston for example and follow the rule of thumb of 30% of your net income for rent, youd need around 80k to afford a 1 bedroom apartment without roommates