The beauty of WordPress, something I hope survives this transition, is flexibility. If you want/need to build something from the ground up, it's possible.

If you want to download a nearly-finished product, that's available too. A hybrid approach is also there.

In that way, I think there should be room for as many themes as the market wants.

IMO, WordPress should facilitate a workflow for professionals and novices alike. Themes are a big part of this.