For me the next step would be make it modular, (units of 4 channels) so that u can mix different units to created ure personal prefference of channel , like 4 inputs, 4 outputs, 4 effects, why not 4 wireless receivers (for mics/ instruments), 4wireless transmitters (for ie or monitors).
Controlled bij mf app, 32 or 48 channels
If 1 unit fail swap it out and check later