Infinite cubic End chunks, upside down chorus plants, spacial "anomalies"?

Allow me to think a little crazy here:

What if The End used cubic chunks and allowed players to build up or downward forever? A player falling for a certain amount of time without making contact with any blocks other than "air" will suffocate (to prevent falling soft-locks).

Having done this, there may be certain naturally generated regions of The End, farther away from x=0,z=0, where islands expand forever both up and down, not as one solid mass, but as an endless fractal of island layers; these could be produced by spacial anomalies. We could also see patches where gravity goes the other way, and chorus fruit grows upside down.