IIRC the rumor leak around that was more nuanced: the leaks reported someone allegedly saying that market economics may not ultimately be able to support more than 2 leaders, because the economics will make #1 and #2 able to profit at prices that numbers 3+ can't compete with due to lack of scale. So the statement was that GCP has keep up or its ability to profit will be at risk, not that they'd shut down just because their slice of the pie isn't big enough if they end up as #3.

I don't believe it was clear who said this, how confident it was that someone said this, and whether it was an off-the-cuff comment in support of a push for more growth or an actual deep assessment of the economics of the space.