Crash is possible after investors dumps their money on fork event.Prices will climb till 6000$ but later crazy movements will result in losses due to hitted stop loss orders. I hold my bitcoins till next year and long term holders always win at the end.
A more speculative approach would be moving into FIAT completely, than placing low buy orders according to these wild swings. Once that filled up portfolio would be all bitcoin again ... getting a rest until new year's eve.
This BT2/B2X/S2X fork beeing a bigger systemical risk than former regulations in china have made a hit.
A complete "crash" seems unlikely there is not much fear in the audience. On the long everybody bullish.