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Is there no starting point for the APR? A best guess?

Rough calculation (possibly wrong): if 50% of current voters become the investor class and the curation rewards becomes investor's reward, 2.5%. If we want to keep the similar reward level, we need to double it (author : investor = 6 : 4)

So, you really expect people to not curate so that they can earn 2.5% instead of the 10-30% that can be achieved now through curation?

It would help if you stated what these different percentages represent.

Current curation reward level I used is about 3%.
9.5% * 75% * 20% (data from steemdb) * 100%/50% (24h active stake percentage)

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