Thing is, he seems to be a loyal player, and you gotta respect that. He already rejected going anywhere first because of their transfer ban, and now he's also unsure. And who could blame him, he is the star of his team, he just won Europa League, his team is among the biggest favourites to win either CL or EL and the two domestic competitions every year, the only thing that seems to be irritating for him there is Simeone's defensive set-up. I wouldn't blame him if he stays in Atletico, like someone said, La Liga would stay stronger for it, and at least some bit of loyalty would come back into the transfer market.
That said, i really hope we're not gonna end up waiting for him for the whole summer. Make him make a definite decision before the World Cup. If he comes, that's good, because he is a world class player, and in this market a bargain at 100M. But if he doesn't wanna come before the pre-season starts, move on and work to improve our midfield in that time already instead, while just put Coutinho up front for the next 2-3 years. He can always play in midfield from time to time, and then after Suarez leaves, we'll probably buy a new world class 100M+ attacker/winger, and after that Coutinho can be morphed back into that Iniesta role.
And as much as i hate seeing Suarez play, since he's so bad right now, buying a world class midfielder or two would improve Suarez's form significantly, i truly believe that. It's about the midfield service as much as it is about having a world class attacker. And if Suarez really doesn't get better even with a world class midfield behind them, just play the Coutinho-Messi-Dembele attack and bench Suarez, while with having great numbers in midfield we can easily put someone like Arthur or Alena in midfield along with that WC midfielder (my choices Thiago and Eriksen because they can play CM/DM just as easily and good as CM/AM. And then in this case sell Suarez next summer (which i think we should seriously consider in any case, as he'll be 32 and even more slow and not agile by then, and since Messi won't move from the middle until he leaves probably, so Suarez is really becoming obsolete). And get at least a good 50M for him instead of keeping him until his contract ends and he leaves for almost nothing, while in that time he becomes another Arda, hated by most of the fan base, which still like and respect him right now for the good 4-5 years he gave this club so far.