Is Medium aiming to be the Facebook of long-form writing?

Stowe Boyd has some serious questions about the future of Medium:

And what about Medium? Are we better off because of Medium’s mechanisms to suggest to us what to read, or would we be better off with thousands of independent curators and publishers, or the basic social affordance of following the best writers, directly?

My fear is that Medium will fall pray to the lowest common denominator attention merchants in the same way every other centralising platform does.

And that would be a shame.