There's 4 GMax forms left to bring to the TCG and Gen 9 is nowhere in sight. There were more Megas than GMaxes and they released those a lot slower than they release VMAX cards. If they can't get all of the Gmax forms a card they're genuinely incompetent at planning.We are yet to get 3 gigantamax pokemon on a Vmax card:
Melmetal, Hatterene and Machamp. Although Pinsir had a mega evolution, it never got a Mega EX card in the XY Era. So was the case with Ferraligatr, Sableye, etc....
So it is possible that we might never get them. Or they might be included in the start deck 100. I mean they are 100 decks and so far we don't even know about at least 10 decks tbh.