Unless it gets 17.5+ million votes, it'll likely just get referred back to https://petition.parliament.uk/petitions/239706#debate-thres.... It'll be interesting to see the response if it does gets 17.5+ votes even if not an official validated poll. Got my vote anyway, miracles may happen.
Whatever happens, the UK is a divided, broken country and will be for some time. It'll take years to finally come through and fix the damage regardless of the outcome of Brexit.