That's exactly what you would expect if a "low end disruption" is just getting started. The low-cost disruptor picks off some but not all of the market, and doesn't immediately compete for the most attractive customers (because that fight's too hard for them at the moment).

That's what puts the incumbent in an "innovator's dilemma": do you chase the high end and high margins, and if so which high-end niches do you chase (gamers who want graphics performance, design-lovers who want a precision machined marvel of industrial design) or do you go lower cost and high volume? The latter is a race to the bottom, so the incumbents tend to pick the former and retreat up-market. It's not unusual for the incumbent's profits to increase temporarily when this happens because of their focus on the most profitable customers.

The problem is it doesn't last: the low-cost producers who are already good enough for the low end of the market continue to improve, until they become good enough for the middle of the market too, and grab more and more market share and more and more profit share. And then, looking for even more growth, they head for the top end of the market (or get disrupted themselves).

Ironically, if there wasn't an up-market to retreat to, there would be no dilemma. Android and iOS would have to compete head to head for the same customers with the same requirements (rather than one taking all the budget consumers and the other taking the gamers and others with higher requirements).

As it is, we could be seeing a low-end disruption, and the high-end consumers will be the last to notice.