As long as BTC price isn't collapsing most won't complain too much about waiting for the few yet unsettled bets till Jan 6th (Jan 20th in some cases).
I would rather prefer to have the Bitcoins in my wallet, rather than trusting the gambling site. The exchange rates are rocketing upward and very soon we will witness a number of gambling sites closing down, vanishing with the funds of their customers (similar to what happened in 2017 December). No matter how trustworthy a particular gambling site is, I don't want to trust them at this point.
I don't think that it's good idea to bet with crypto on long term outcomes, sorry. There enough legal books where you could bet with fiat money and be sure that everything will be smooth and fine.
. It's my advice to all