How the hell is 8gb considered big.. there are games with 80gb+ in size, Duel Links is also a PC/Steam game not just a mobile game, if it can't get bigger in mobile it can get bigger on PC
As a matter of fact man, V-rains is being considered the best sequel among fans in Japan because of it's complex and mature plot, it's not just "dark" as gx or 5d's. Have you seen the dissection of Earth in Vrains? it makes u think a lot. Anyway, plot aside... I don't think Link monsters are bad at all. If you love 1st gen, u can play anti-meta forever, it'd remain decent.
100 "Number" monsters won't jack up the game's size that much unless they give an animation for every single one of them.
I mean, look at how much different cards we got in a main box.
Also, look at the size difference pre-5Ds and post 5Ds today. We still won't break 3GB even during Zexal era.
I doubt we'll get animations for most of them. Can you really see them giving an animation for Gold Rat or Freezadon when we don't have animations for cards like XYZ-Dragon Cannon or Elemental HERO Shining Flare Wingman?