The question is how committed to the "cause" are they?
For now they are still committed ideologues, you could say extremists
The same survey had 99% not planning to return to HK
There are some other questions left unanswered
1. How many have already gone back? If this number is significant, than it would explain the 99% number.
2. Are any realistic assumptions made? If you saw any of the initial parliamentary reports, they basically assumed they would be getting a whole bunch of doctors, nurses, engineers ("highly educated and high quality individuals") and they would immediately be contributing into these fields and not be packing biscuits at a factory. Of course that was never realistic, does the group behind the survey harbour equally unrealistic expectations?
3. Not a question that can be answered in this survey, but a something to consider. How much bitterness can the BNO's eat? If they moved as a family, can both parents sustain this kind of lifestyle impairment? Or will the unhappiness cascade into a divorce? Are the kids happy? If not, are you willing to sacrifice your kids' happiness for your political statement? (going to be very unhappy golden years if that's the case)