Leaving aside the correctness or otherwise of disregarding the views 30-40% of the population (although I agree their position is likely to only be transient and very influenced by the here and now), I’m not sure your maths works. If you take the 40% away who want to wear masks forever, you’re still left with 50% of the remaining respondents (30%) who want a time bound requirement to wear masks. So not a minority.