I'm pretty sure Android is growing faster than iOS, worldwide. And most of the users that get entry level or mid range level Android phones won't "upgrade" to iOS, they will just get better Android phones, since they already know the system.
Barring some super successful entry level iOS device [1] being introduced by Apple, which is unlikely, Android's market share will only go up. Apple will still be super profitable, though.
[1] And that won't happen, as Linus from Linus Tech Tips put it: Apple is jewelry and people don't buy cheap jewelry :)
First one is true. Mostly because Smartphone Saturation. The growth are in Low Pricing phones, 80% of the Smartphone in India are below $250. And Apple doesn't have phone below $400.
The Not Switching to iOS is false. While everyone has expected that, in reality Apple is still growing its user base, at a rate of roughly 100M in 18 months. That means roughly 25% to 30% of all iPhone purchase were coming from Android.
There are Currently 5B Mobile User World Wide, 3.3B Smartphone, 2.5B Android, 800M iPhone users. Both the Smartphone and iPhone user base are still growing. So Apple has roughly 25% of the world market share. This is not bad consider there are 500M+ Smartphone users in India which Apple has less than 2% market shares.
Looking at the trend line and from line of speech, I think most analyst ( Well, only a few really. Most of them don't care about its actual market usage. ) were predicting the 1B iPhone user base by 2020. Fueled party by iPhone XR, or the supposedly affordable iPhone. Now it doesn't look like it.