Sorry to hear the bad news.
I assume the customer service person at ETS is just reading the same publication you are, without necessarily having any more information than is posted on the Internet. Therefore, you may also want to consider talking to a supervisor at ETS. I don't see how waiting will help much since these things seem to be planned way in advance. The only benefit I see in waiting is there may be a small chance that the online registration (which wil be available by August) may have more accurate data regarding test centers.
My guess is that you will need to go to another country to take the exam. How much money would that cost you to book the flight?
On the positive side, if you time it right, it could also be your honeymoon destination And I don't know how long it would take to get the passport/visa (assuming one is necessary to go to the country in question), so you may need to make visa/passport prepartions now just to be safe.
You may also want to consider contacting last year's test center (since there was only one, I think) and see if they can tell you anything, like maybe they can verify they are no longer participating. Or maybe you can talk them into participating again, though that is very doubtful. You may have a shot, however, if that test center was unaware they were the only test center left.