Do YOU want to miss out being a share holder on this new line that will bring immeasurable wealth ?? ;-)
Simultaneously too wealthy to imagine and never wealthy enough. Capitalism is quite the drug.
An alternative sequence of reasoning places less emphasis on Ilya specifically and uses Ilya as an indicator of research health. Repeat (1), (2), and (3) above, but replace "Ilya" with something like "strong and healthy fundamental research group". In this version, Ilya's departure is taken as indication that OpenAI no longer has a strong and healthy fundamental research group but that the company is "compromised" by relentless feature roadmaps for current products and their variations. That does not mean OpenAI will fail, but in this perspective it might mean that OpenAI is not well positioned to capture future research breakthroughs and the products that they will generate.
From my perspective, it's just about impossible to know how true these premises really are. And that's what makes it a bet or gamble rather than anything with any degree of assurance. To me, just as likely is the scenario where it's revealed that Ilya is highly ineffective as a generalist leader and that research without healthy tension from the business goes nowhere.