We wouldn't be able to compete in the world like we currently do and it would take massive changes. Reduce work and earning potential. I for one don't want that, as much as I would love weekends off, my earnings would probably drop by 50%.
Funny, countries such as France do not seem to be impacted that much.
I think that Sunday working should remain the exception and not the rule, the benefits of extending shopping hours to a full 24/7 model are specious at best and I think more emphasis should be put on allowing people a day where they can relax and spend time together as a family unit.
I realise that this is not practical in all instances or industries, although making Sunday voluntary is not that difficult to implement in most cases anyway (in many businesses it is already the case, or contracts specify limited Sunday working, such as 1 in 4 for example, lr they hire people on Sunday specified contracts that include Sunday as one of their work days) and would potentially create more jobs, particularly part-time positions for students and people who would rather work on a Sunday for whatever reason...... but I think a further erosion of the idea that economics should always take precedence over social cohesion is a bad idea and we should be encouraging familial and social interaction and cohesion as much as we can, especially in our society blighted by broken homes and the breakup of the family unit.