While most of us here would use such a device to digitize vinyl or tapes, this is not the primary use for an ADC. It is really a tool for musicians to digitize their music. The prosumer market of at-home musicians is only getting larger (from what I can tell). With their expertise it may be possible for Schiit to compete with companies like Apogee and M-audio. And entering that market could potentially drum up business for their other products. I'd be willing to wager that a lot of the headphones that those at-home musicians use to mix/master are woefully underpowered.
But hey, we're just armchair quarterbacking here. I just know Jason & co will continue to release awesome Schiit, whether he likes our ideas or not.