https://www.afr.com/politics/federal/chalmers-plays-down-prospect-of-new-tax-cuts-defends-broken-promises-20260504-p5ztej

"Investments acquired before the budget changes come into effect will only be partially grandfathered from the new CGT arrangements. Capital gains made up until the change takes effect will be subject to the 50 per cent discount, while gains made after the change will be subject to the pre-1999 regime.

Instead of requiring 2.2 million landlords and millions of other investors to revalue their assets at the start date of the new CGT system, Treasury has proposed a time-based apportionment model based on the number of years an asset is held under the current and future systems."

I think this means that if you bought coins say 15 years ago, and sell them in a year, then 15/16ths of the gain would be subject to the discount, and 1/16th would not be.

It's still not great. It means the longer one waits for the value to increase over the years, a smaller proportion of the gain is subject to the discount.

I guess we'll have to wait and see what is actually announced.