There are very, very, very few people who are 'ineligible' for adoption. People with convictions for violent crimes and crimes involving children are amongst those that cannot, or those with uncontrollable mental illness.
It's certainly not 'the end of the road' just because your husband has sperm issues. There is ICSI, which can work if a bloke has only ONE normal sperm in the whole of his ejaculate. They only need the one sperm.
If you and your husband don't have children you're eligible for IVF as well. It's just a case of waiting out the waiting list, which is what everyone has to do. Obviously, that depends on where you are but I did read some of your previous posts and it says that you will be able to do IVF if you wait the two years.
At the end of the day, if you really, really want a child then 'giving up' is not an option. Especially when you DO have options. 'End of the road' is when there is truly nothing left and that's just not the case. I came very, very close when I lost my IVF twins last year. I'd been off the pill since December 05 and had FINALLY got pregnant through fertility treatment that made me feel like an emotional wreck. My hopes were up. For three weeks I was 'pregnant'. Then for a further three weeks I had to carry around two dead babies because my hospital were such utter heartless barstewards that they kept sending me away. That felt like rock bottom to me but then my mind cleared and I realised that it wasn't 'the end' until there truly was nothing left to try.
Sorry you feel so low. It does suck. But, you are 27. You still have options. Don't throw in the towel until you don't.