First of all, the employees are not _forced_ to buy there, they can still commute like before. Speaking of moving, the company made quite an investment building

First of all, the employees are not _forced_ to buy there, they can still commute like before. Speaking of moving, the company made quite an investment building those houses so it will be less motivated to move easily someplace else. But if it does, what's stopping other businesses stepping into a pool of workers which may - or may not, of course - be readily employable in that area?