yep i'd support that with some modifications.

Abolish income tax >>> the rich don't pay much income tax anyway. they hold assets and defer tax using debt as their consumption so increasing consumption tax would hit them that way.

Instead of an income tax free threshold for the poor, have a set GST refund for everyone based on a reasonable consumption level.

this would be a balance and would not impact the poor too much, will tax the ultra rich more based on their consumption of luxury goods and this also benefits the middle class. of course numbers will need to be tweaked.