"Stock market of ideas" would be less strained, which still inclining towards misleading. Ideas are just not very much like goods or stocks or material possessions of any kind. While Holmes' metaphor is pertinent to his argument, it's still not a very good metaphor, and the extension of it as "marketplace of ideas" is even less so.
"Evolution in the ecosystem of ideas" is a metaphor I prefer, although again metaphors always mislead even if they are mostly apt.
PS: I'm all in on Cynicism Corp. and their strategic partner, Doubt Group, with a small holding in Humanism Inc.
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Better educated sadness than oblivious joy.
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