I think he means that it will be replaced by something else and the end results will be the same. A lot of problems we attribute to racism will be there due to some other cause. Problems have multiple sources, and solving one will not solve the problem. A common debate in society is precisely about how much of a given problem is due to racism. Some people assume it's very high, and others say it is just one amongst many.
Is everything a result of racism? I have no idea. I kind of doubt it. But the comment above gave specific examples of things that impact us to this day that are clearly based on racism, and that won't be solved simply by a generational shift in attitudes (which has largely already occurred in the US).