Eventually, but currently 7.50 an hour is much cheaper than a state of the art burger flipping machine. Once that changes, I assume the unemployment rate will rise and legislation against inequality will be needed.
Except oppression isn't necessarily an end and allowing certain groups to define oppression or deriving it from immutable historical fact simply creates another privileged class and gives one a stick to beat oppressors who may not even intentionally participate in so called "oppressive acts" with.
I argue fighting oppression is only useful insofar as it presents a utilitarian good for society and that certain levels of structural violence is necessary for nation states to function. At the end of the day, there always needs to be a (large) class of street sweepers, accountants and restaurant workers for the benefit of the rest of society.