There is a good chance that ecollars will someday be banned. Veterinarians have had a significant roll in getting tail-docking banned in certain provinces here in Canada and they don't look favorably upon the use of ecollars and prong collars:
http://www.canadianveterinarians.net...thods-for-dogs
The animal welfare folks just won a major victory in how farm animals are treated in Canada, and I doubt the general public really thinks about farm animal care. Imagine what will happen when they turn their attention to companion animals. They are organized, have funding and veterinary professionals behind them. So one can never say never.