DO is the wave of the future. Many people don't see that yet, but it'll be the degree that will gain more and more relevance in the next 20+ years.
What I'm saying is not that DO will overshadow MD. That would be an impossible goal. However, the investment DO is putting in building new schools and creating awareness will be what eventually start destroying the Caribbean MD completely. People will no longer feel forced to go to the Caribbean for fear that their letters will make them seem inferior. It will give them a second option inside the US. Eventually, the number of residency slots taken over by new DO students will make it a worse gamble to go into the Caribbean.
Seriously, don't be surprised when 20 years from now 1 in every 4 or every 3 physicians is a DO and the US government stops giving support to schools like SGU, AUC, and Ross through federal financial aid.
The only failing the AOA has right now is that it isn't making a push to get into more state schools (like they did with MSU or UMDNJ). If the AOA starts approaching schools in states without medical schools (Idaho, Wyoming, Alaska, etc.), the DO degree will explode.