I don't think it's a bad idea. Well, don't tranfert ALL your bitcoins, but 50/50 doesn't seem absurd. At least for January, where there is a strong chance for XRP to continue to rise.
In my opinions, a lot of people here value BTC more than XRP because they are biaised by the ideology behind it. "Bitcoin is freedom, Ripple is the ally of the ugly bad bankers". Man, who cares ? XRP is faster and cheaper than BTC, it has a REAL utility and banks are starting to show their interest. BTC is a dinosaur in comparison.