Why not? We link other things with employment for cities where there's a large, concentrated number of employees. Towns with fire departments owned by the companies.

Do we really need to make things harder for self-employed folks? That insurance is in any way linked to your employer is already complete folly. The car insurance, single-payer, and exchange-based models are all fundamentally better than the "no one knows how much anything costs" model of employer-sponsored health care.