[![][1]][1]

What I get from an X of size $11121\times11121$ at just around the point where information travels to the tips.

Even from Xs ten times as long, there is Methuselah-like ebbing and flowing of debris near the center amid a pool of still lifes and blinkers still thousands of generations on.

[![][2]][2]

Just going from experience working on the Busy Beaver of 5, I would imagine this question might be enormously difficult to settle, owing to the globally fractal and locally random nature of the picture.

  [1]: https://i.sstatic.net/bDOBX.png
  [2]: https://i.sstatic.net/tx6TJ.png