Morphogens

Morphogens are signalling molecules found [and formed in cells]. It goes down a concentration gradient across cells. the different concentration morphogen exposed to cells, changes its cell fate.

In the future, why don't we just have a blob of specialized tissue, where, with the use of morphogens, we can manipulate it to becomes any thing. I am aware that this technique is used to create neuronal cells; however, it can be used to grow bones, or muscles or skin, why not paper?