re: It looks like there will only be one MTO
You still missed my point - to get high data bandwidth back to earth, you need a big dish, with a powerfull transmitter with a big set of solar arrays ( see MRO )
I dont doubt there's value to be had in an array of small craft - but to be honest, 3 big assets in geostationary orbit on mars would, imho, be much more worth while.
The high bandwidth relay jobs for NASA are done via TDRS, a couple of very powerfull assets with upwards of 100mbps downlink - not the iridium network or the GPS network :)
Doug