It amuses me that Zelda 2 got so much flak back in the day. Modern Zelda games probably have more in common with Zelda 2 than the original. The game was ahead of its time.
Tales of Phantasia and CastleVania: Symphony of the Night owe their existence to Zelda 2. However, I doubt that Nintendo would remake Z2 in any way, shape, or form. (Unless they release it out of the blue a la 3DS Metroid 2.)