They will have to change it back to how it was, or the restaurants will simply close down as they will lose money. They make a HUGE amount of profit from selling beer & wine. I'd love to be a fly on the wall when Gordon Ramsay finds out, he'll be furious!
And no, alcohol isn't super-important to Westerners Flor1212, but for many of us our enjoyment of a meal out is enhanced by a nice glass of wine or two. A civilised little drink, not to get really drunk & stupid. I, for one, will not bother driving across Doha to get to the Pearl for a mediocre meal if I can't have a glass of wine with it. I'll just continue to go to the hotels.
The problem with Qatar is that it seems to make decisions on a whim, and they change from one day to the next - nobody knows what to expect, and there is no recourse if the powers that be decide to enforce a new law. Just like that.