Just ending the DADT alone will prevent any gay person from joining the military. I assume by you posting this means you would like to see gays being able to join openly but ending the policy will not do it. Congress would have to enact legislation which would stop any discrimination against homosexual people. Add to that the change in attitude of the people to accept gays and lesbians in life which would be even more difficult than just changing the law. Even the younger generation now has little tolerance for the homosexual people so DADT is not much of an issue.