Could this keep the UK united and in the EU?

[Intell]

1. Give the 2 year notice of intent to leave the EU
2. Hold a referendum in Scotland that says IF the UK leaves the EU, do you want Scotland to become independent and stay in the EU. This presumably passes easily.
3. Now, have another UK wide referendum to confirm whether the UK should in fact leave the EU. It's pretty clear at this point that voting for the UK to leave EU is also voting for Scotland to secede.

But why should the UK be in the EU?