I think the bottom line comes down to this: A gap up takes and expends a tremendous amount of energy and NUGT , et all, need a few days to build cause for the next move, and, with the completion (or very close to the completion) of the measured move, one has to expect a pull back or sideways consolidation to follow. The at 69 is very close to being overbought and a little sideways action or pull back would allow this indicator to recycle lower and then reset for the next move up. Further, NGUT has been and is likely to remain an extremely volatile .
So my plan for now, subject to change at any time without notice, is to hold through what I expect to be a volatile period for the next few days. However, should gold and NUGT fall off a cliff next week, I'm likely to cash out and wait for the next buy signal.
Edit: Just wanted to add that this also has the potential of being an abandoned baby. Either way, island reversal or abandoned baby, both require a gap fill as the confirmation.