Dedicated handheld gaming is 100M at best right now, most likely 90M. Of course SONY doesn't see a viable market with Nintendo taking a large chunk of that.
The fact of the matter is mobile gaming is largely dominated by smartphones with a sizable but still niche chunk through dedicated handheld 3DS and maybe the hybrid Switch if you want to classify it as part of that market. I expect smartphones to continue to put the squeeze on mobile gaming leaving an ever smaller sized dedicated handheld market. Maybe the hybrid market the switch created will be big enough to handle pressure from both sides from smartphones and consoles. Time will tell.











