Greatly reduce. Setting it to 0 is impractical and has way too much collateral damage, but I’d guess that western countries like the UK could reduce it to less than 10% of what it’s been over the past few years with mostly no issues (except for businesses that are like relying on importing lots of workers for low pay in exchange for visas or something). I do not count reduced growth or whatever as an issue; distorted markets are problematic and need corrections, so there’s going to be a penalty on our gdp either way.
It doesn’t even have to be permanent, but needs to placate the right.
This is such an obvious choice that it boggles my mind that anyone fights against it (besides politicians with bad economics and no ideas)