Whether masks stay or not depends on the public opinion (at least in democracies). Living in a place that introduced them early and extensively (they were compulsory everywhere in public), I can see major shift in public opinion after several months and the support for mask-wearing diminished. In the beginning, many (most) people wore them even before they became compulsory. These days I see people mostly ignore the rule wherever it's not enforced. Few months ago, social media was full of people advocating for masks, these days I see most people take them off at the earliest opportunity and if someone talks about masks, it's all about getting rid of them. I believe the shift in public opinion will be similar in western Europe.

Austria is getting rid of face masks in shops from mid-June (they remain compulsory in some settings, such as services, but I hope that will be discontinued soon too). Slovakia just announced that face masks will no longer be compulsory outside and in offices, although they remain recommended. As another update, Slovakia will no longer enforce social distancing in restaurants and bars, there will no longer be a required spacing between tables (although government still recommends 2 meters) and it was announced that clubs should be allowed to open soon.