People are the most adaptable creatures alive, so yes I could adapt to that situation, and I think that I could even grow to like it. But I'd prefer to have at least some animals around.
EDIT: Now that I come to think of it, you (the OP) didn't really clarify what do you mean by "completely alone" term, because in a way some people are just that today even if they are surrounded by a hundred other people. A few days ago I was at a bus stop, just gotten into the bus, and while the bus was standing and other people were coming in, I was watching what was outside. There was a guy who just out of the blue started vomiting and he was looking like he is going to pass out. Nobody even turned around to see what was happening, nobody offered to help, nobody even wanted to take a look at him. And in a way he was completely alone, among so many other people around. This is one of the most disturbing things about our society today, IMO.