A vaccine is FAR more likely than a cure. For MOST viral infections, there is no cure, and with HIV, a retrovrius, it is unlikely.
We still don't have a cure for the common cold, and influenza. A cure would be wonderful, but just think of all the other diseases out there with no cure, only treatments.
The thing to be thankful for is how far we've come in the treatment for HIV/AIDS. MANY people are living completely normal life spans...