That's true - we won't consider anyone without a good command of English. However, as written below, we think the overall communication could get fragmented if there was only one English-only speaking person in the company.
Since you're hiring and working remotely doesn't this severely restrict your hiring pool?
This might be a bit controversial (purely my opinion, not company's) but I think that you'd rather either go full monty and employ 100% multicultural crew or rather stick to a 100% monocultural group. Why? For easier communication.
I recall a situation, working at my previous work, where we hired one guy from South America. His tech side was impeccable, his English needed some brushing up, he's really amiable yet the main problem was people not always switching to English with him around. Not out of malice, some people weren't that comfortable with Eng.
/ EOT ;)