"Scrap the concession on CGT or link it to inflation rate"
Ummm, CGT is already linked to inflation. You can use either of the two methods to calculate your CGT obligations.
https://www.ato.gov.au/individuals-and-families/investments-and-assets/capital-gains-tax/calculating-your-cgt/cost-base-of-asset/indexing-the-cost-base
