Brahms believed that there was no need to publish absolutely everything that Schubert ever wrote.
The future? Like unwritten books and unborn children, you don't talk about it.
But, on the other hand, if Schubert were alive today, he would find even richer fields to plow.
Rather, I believe that it is very good, if, with the aid of his songs, we can be reminded, among other things, of the social conditions under which Schubert had to work.
Which is why, in my lieder concerts, I always strove, when possible, to sing only the works of a single composer, so that the audience could be gradually drawn into a particular creative genius' way of thinking, and could follow him.
If you only do little clusters - three or four songs by one, and another, and then yet another - you lose the opportunity to think your way into the composer's mind, since, after all, most of these pieces are quite brief.