The supposition that racism is disappearing and that therefore race is becoming a non-issue is flawed on a number of levels.
First, it presupposes that racism is disappearing. If by "disappearing" you mean "rarely stated openly" then perhaps you have a point, but to say that the overall racism held by people personally is declining in any significant way is, at the very least, unsupported by any evidence I have seen.
Second, even accepting the first part as true, the issues associated with race are not 100% tied into racism. Cultural differences can create problems in an environment of total racial equality and acceptance.
Thirdly, your assertion that ignorance = racism, and therefore an less ignorant person is a less racist person is demonstrably false. Many very intelligent, well educated people are also virulent racists. Racism is closer to religious faith than it is a mere lack of knowledge. The racist knows that the object of their hate is all the things they believe them to be. It doesn't matter what contrary evidence is presented to them, that's just more evidence.
This isn't universally true, obviously, but to dismiss racism as mere ignorance is to empower it in a way.