Well if the work you did previously earned you 1btc & you kept it then you still have 1btc. But even in a fiat free hyperbitcoinized world, the work you have done previously will earn you less btc in the future because the amount of goods relative to bitcoin will increase forever. Work that produces the same amount will earn you less btc as time progresses because less btc will buy you more.

Total btc = total stuff

Total btc always stays the same & total stuff always grows

Same work produces same stuff

Same stuff = smaller % of total stuff = smaller % of total btc

But most people will have ever increasing access to better tools which will also make them more productive. So similar effort may produce much more stuff.