I don't think you should even be asking a bunch of Aspies that question. In general, we need a lot of solitude and privacy, or we get driven up the wall, and with even one sibling, you wouldn't get that. For a bunch of NTs, probably. My mother was in the middle of eleven, and I did envy all the sibling support she got after she was grown. But she wasn't an Aspie. An Aspie should be an only child, with a lot of cousins living nearby (which was what I had, and I've had a reasonably good life).
However, having several did appear to work okay for Luke Jackson ("Freaks, Geeks, and Asperger Syndrome").