Why do you think it will get that much better at CN? OK the sheer size of the stadium and the close stands will mean a more intimidating venue but without fans leading the chants the atmosphere will continue being bad.
It wasn't good even when Grada D'animacio was in CN, without them it'll be even worse.
They will definitely try to do something about the atmosphere, that is clear. It depends how successful they are really. There is an opportunity to make it far better than it previously was if they can get a group together that will fill out the Gol Nord lower stand.
Preferably a younger, more passionate, intimidating group, which has been the tactic of other clubs in the league, specifically the Basque clubs.
In the games that they were needed ( the big games ) the atmosphere was very good for a big club, which nowadays are full of tourists, across all the leagues. Even for the smaller games, the atmosphere, when compared to other big tourist laden clubs in Europe, was also fairly good.
However, the Grada, as fans groups go, were really not that great. They were tiny in number, most of them didn't even bother turning up to a lot of the games, and they could barely fill the Gol Nord lower stand, even for the biggest games. And they were not nearly intimidating enough for me.
They can make it a lot better, but the big question is , do we have supporters passionate enough for the job ? Or, should we let in a dedicated group for free if they will sing all game, which almost certainly seems to be the case around other clubs in La Liga and potentially abroad as well ( PSG etc ) ?