"Save Padmapper" seems to be selling the company short given the diverse set of data sources and partnerships they have. I hope Craigslist comes around but my bet is PadMapper will be more than fine regardless.
Just focus on making the SV/SF market amazing using padlister or partnerships with property managers. Displace Craigslist in real estate in their home market.
For my geographical area at least, the removal of Craiglist might improve the signal-noise ratio.