They could be losing interest because of the POB price that keeps dropping and we all know that everyone can't be a risk taker or bearer, thus, they sell to avoid lose. But I feel this is not the best time to back out because POB community needs support now, if we keep unstacking and selling of our POB, it strength will keep reducing, but a situation where we hold POB and stake POB, a time will come that the demand for it will become very high and this will definitely affect the price( it becomes higher).
Lastly, proofofbrain should come up with a very clear strategy that will encourage stacker and holder of POB also the new member of the community.