Obviously, this will be a low rate, but I have seen some say that as low as 1BC=$13.5k, is this plausible?
Yes, it's plausible. If you can get this price, consider yourself as lucky due to current price tend to increase, over $16,000 at the moment.
Bitcoin fall to $12,980 in December, 31st and around $13,363 in January 3rd (
https://coinmarketcap.com/currencies/bitcoin/#charts). I'm not sure if you can get the same price in the nearly future, maybe after few weeks when bitcoin get corrected again, it will fall to around $13,000 for sure.