Nearly every gen has a three stage bird line.
Nearly every gen has an own pikachu clone.
Nearly every gen has a two stage rodent line.
Nearly every gen has a two stage birdline following said rodent line.
The original forest with the three-stage bug.
The original tier-1 magikarp only fishing rod.

I get that having the three starters is a nice tradition and people have learned to hate zubat caves that much that they cannot life without them, but dont you think some patterns should be finally discarted?