One of the large Australia carriers is promoting 5g as a "paid add-on".

There is some marketing material saying it'd cost an extra $15 per-month on top of your normal plan's price. With "first 12 months free" to try it out. This is a 20-30% premium for average prices.

I can see the uptake of 5g in that case being less than 5%.

4g is already fast enough for most things, so very few will actually need faster.

I'm not sure if they are completely clueless thinking people will pay extra, or they are trying to discourage large uptake.