First they have to cancel the visa ban for 2 years. Because if you can transfer your sponsorship with out visa ban so that employer will offer good facilities and try to keep every good employee and worker with them. other wise they will threaten them that they will cancel their visa and ban them for 2 years and it will spoil employee's future. so without further word that employee will remain in that same company for their family. this is what happening in Qatar now.. if any body cares about workers welfare they need to consider this first.