Everything is in CHF. Of course inflation and depreciation of the USD will reduce nominal gains. In the last 30 years, SPI, S&P 500 and MSCI ACWI IMI had real returns in CHF of about 7%, 8.5% and 6% p.a. respectively. I just assumed 7% p.a. for the above calculations.
The above info is a bit outdated, as meanwhile, I compared world ETFs with domicile in US and IE in this and this post.