The article is not about the platform manufacturer being successful, it is about the developers being successful.
Assuming what you say is true, then the developers have to look at the potential return on developing for that platform. Developers sell "seats" and they don't care if it's a Barcalounger or a platic patio chair, they get the same return on either one. Market share may not matter to Apple, but it has to matter to those developers, because market share is seats.
Yes, what you say is quite true in that regard.