Money don't grow on trees.

Ozzke almost went broke dedicate fully for PND for an extended period and it came a time he needed to pull his life back together.  The devs made many real life sacrifices to give PND a reasonably good chance to succeed.  They were great volunteers.

This does not mean those key figures won't rejoin in the future.  

Meanwhile, community can and need to continue to evolve the usefulness of PND.  

I can't put the concept any simpler.