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No, in A Thousand Sons, we just get given that impression because all the important characters were psykers. They state outright that some brothers don't have enough power to light a candle.

I was always under the impression that all the Thousand Sons had some form of ability, though for the majority it was nothing more than having 'feelings' or premonitions occasionally (sort of like a sixth sense) that enhanced their combat. This was far too weak to be developed and essentially useless - these guys were turned into Rubricae

Those others who had greater talent were enhanced further by the Rubric.

Since squads at 9 strong, with a sorcerer leading I'm leaning towards 1 in 8 being a strong enough Psyker or 1:8 or 11.1% of the population at the start of the Rubric.

I expect this number to have fluctuated as new Rubric marines are not made (unless you believe that filth they inserted in the new Chaos codex about Abaddon hovering up rogue 'experts' who make Plague, Noise and Rubric marines for him). While the Rubricae are immortal essentially I'm sure some have been lost - such as in Ahriman: Exile where they teleport into the hull of the ship (I think it was that book it happened in?)

 Furyou Miko wrote:
No, in A Thousand Sons, we just get given that impression because all the important characters were psykers. They state outright that some brothers don't have enough power to light a candle.

Now that you said that quote, I remember that being from the book. I had forgotten that not everyone was a psyker, just a high percentage of them. This just gives more fuel to my Blood Ravens hypothesis though...

We'll see how it was with the 30k Prospero book.

I hope they get a lot of psychic gimmicks, but of course the grunts won't have any psychic potential (or Spireguad as well, if they do show up in the book)