Let me chime im, being active in this space for some month... It is not my impression that bandwith is a signficant obstacle... The pattern I see is files are stored and not an awful lot of net traffic thereafter...
I have said this many times in the forum; the demand afterstorage in the SIA network is not there yet... We have less than 2% utilization and a lot of new hosts joining... It took me months to fill just 200GB of space.
The world of SIA needs now a good way to implement use cases that can boost demand for storage..