There's certainly an opportunity for another platform to surge up with more favorable terms than Bandcamp gave to artists, or to provide a turnkey solution for artists themselves to handle the sale of their music digitally, and then offer the thing they really want - a curation and promotion service such that people can find somewhere to trust to help them find cool new acts, or well-established ones, and give their money directly to the artists. The reason Bandcamp Friday is so popular was because it was actual artist support, rather than artists not getting nearly as much as they deserved for each sale. We've all figured out that record companies and their contracts are scammy and profit the companies far more than the artists, so any platform that can provide the maximum amount of profits to the artist will be the one that everyone wants to use.

Also, I believe that, "coincidentally," all of the employees who were part of the union bargaining team were laid off in the sale. SFGate article says that the unionized employees were hit disproportionately hard in the layoffs, so I think we can safely accuse Songtradr and Epic of union-busting tactics as well.