Neither of those options are going to happen.If that the case then I can see two options here
A- The UK ends up exploiting this hole within the single market. That will bring the end of the EU.
B- Hard borders is imposed on anything coming out of the ROI which will be pretty much the same as kicking Ireland out of the single market/customs union
For certain the EU will not renegotiate the Protocol nor the Withdrawal Agreement nor will Ireland leave the EU or be chucked out.
If the Uk break the protocol or the withdrawal agreement they may as well forget any deal with anyone worldwide. Current deals will probably have terms to cancel them if they break international law.
Sanctions will be imposed on the UK .
Playing to the UK audience is not going to help them in the big wide world.
It is not only international law they would be breaking but British law too; These Brexit liars might just end up behind bars after all.