Nobody could habituate to the horrible tinnitus I had at the start and it's beyond patronising that the healthcare providers - ENT and NHS audiologist - thought that was a reasonable ask. When I first posted here, the BTA had a line on their website that said there wasn't a strong correlation between tinnitus symptoms and the reaction to it. Utter, utter lies.
My tinnitus has gotten much better in the 4 years since it first developed.
I would say I'm habituated at this stage, but I would also say that's been largely due to the improvement of symptoms.