I read it as him saying that it's considered too expensive and difficult for a private company at this point. In other words, "impossible". Likewise, people t

I read it as him saying that it's considered too expensive and difficult for a private company at this point. In other words, "impossible". Likewise, people thought the 4-minute mile was impossible until it was done, even though there were probably some people who knew it would eventually be possible as our diets change and people grow up stronger and healthier.