Survival of the fittest and all that. I agree in the importance of our language in that English is the language of international aviation, international diplomacy, and international finance. Because of the vast economic implications I agree with the importance of the English language, but I want to raise an objection from an evolutionary point of view. English is the language of commerce. Commerce means businesses and jobs.
Jobs create incomes which are needed to form staple family units.
Staple family units pass strong family values onto their children which contributes to strong communities. Repeat the cycle over and over again until you have a strong nation. Hence, Ebonics represents the local species' attempt at adaptation in local environment void of commerce and jobs. Quite simply, Ebonics is the local language of survival adaptability that has no reason to speak English. If you want to replace Ebonics with English you must have a reason for the people of the area to speak it.