There seem to be several peculiar assumptions underlying the arguments made:
- Workforce planning is a science
- The future will be like the past
- Change is easy
- Equity matters
- Cost is not a consideration
- Consequences can be accurately vectored
People make decisions that serve their own perceived interests; governments do the same.
Should UK graduates be preferred? Yes, that is fair. Should foreign graduates be locked out? No, but the rules should be stated clearly and commitments already made should be honoured.