I think the memorization theory means that in later stages (no one knows when) drugs that focus on the inner ear are not gonna work. Basically your brains limbic system and the attention center are involved in chronic tinnitus. Thats why drugs like AM101 wouldn't work - because they only focus on area of the brain that is connected to the ear. Therefore different drugs should be used. Nowhere is it stated that memorization means that it is gonna stay there forever and cant be treated. You brought the depression example yourself- theres a reason why depression is not treated with injections. These are just theoreis of course, and need more data anad analysis. Could very well be that it turns out to be wrong (as they are still fighting about it).
However, Autifony Therapeutics is working on a centrally acting drug (AUT0063, look at the research forum). I think they might start testing it on chronic T already this year so could be that by 2015 we know whether this works or not.
Also, little effort has been put into researching what are spikes and why they happen. Because if they do happen in the ear then maybe AM101 could help with that
Naturally I am also hoping that it might help chronic sufferers and that it will pass the trials. Im simply saying that there is a 50-50 chance that it wont help people with chronic T and that the treatment working on us might reach the market in 10 years maybe. I have to say though that Im putting my bets on Autifony, as it is specifically designed for chronic tinnitus.
If you are interested in the subject I suggest you read this whole thread. There was a man here - ResonanceCEO - who is working a treatment for the inner ear. He had some wonderful insights about the matter