Personally, with all the flaws I see with Steem, I don't see it happen. But I do have to admit it's still in its premature stage and things could change in due time. If things come to mature properly and Steem is to stay the #1 in its specifc utility, then yes, it could happen. I see EOS have 1 trillion market cap 5-10 years from now (unless competetion arrives of course ^^), so it ain't too far fetched. After all, Blockchain technology is gonna revolutionize things as we know it.