Whilst I do not deny that restructuring a business in this way that separates the profitable and unprofitable parts is going to drive a wedge between the bits wanted and the bits rejected, I am not sure about your assertion that statutory obligations to employees (your main concern?) can be circumvented.
If you are part of a busines that is sold on, or put into receivership then sold on, I know of nothing that prevents TUPE transfer applying - to give you a certain level of protection for your existing employment contract terms.
If part of the business goes belly-up with zero assets, there are regulations to ensure that staff receive notice money and minimum statutory redundancy money.
I accept that there are probably ways of 'restructuring specialists' making sure that one bit of the business moves forward profitably leaving another bit dead in the water, but don't believe it impacts your statutory rights.
What have you heard / evidence have you got?