Has Planet considered the possibility to build a Landsat-like Earth observation system? My colleagues at NASA and I did a study for a next-generation Landsat which developed concepts for a Landsat with much better spatial, spectral and temporal resolution, and costing significantly less than the current system. NASA management was not interested in following up and is now just building a copy of the last Landsat.
Please let me know if you might be interested in this possibility. This is particularly attractive as the Landsat archive is now available to all. I will be happy to fill you in on all the details of our study, and on the work that I have done to promote this project. More details may be found at: http://fullspectralimaging.net/.