Depends on what you're looking for or think of as "gaming".
My take on the situation, based on current trends and observations...
-For consoles, I'm feeling more confident every year in saying that they've peaked and are on the decline; really for the first time since the crash of 83'. Consequently, "Traditional" single player games (at least from quality productions) are slowly going the way of the dodo due to this push to make everything online-centric (you will get your always online DRM, and you will take it with a smile).
Some will be quick to dismiss this as a normal part of the console cycle and point to all manner of sales numbers, and how this or that is "Teh best numbars ever!", but in doing so will have to uncomfortably shuffle around explaining the REST of the market. Market share isn't about who is booming, but who is booming the most, and while next gen consoles are booming, everyone else is collectively booming more.
(if nothing else, I have NEVER seen this much cynicism in the first year of a new console; there are always naysayers, but this time it seems very widespread. The Xbone debacle may have saved Sony, but it strained consumer trust in a way I have never seen in the console market.)
-Service-centric games (MMOs, F2P and all that online jazz) are definitely on the rise.
-Mobile gaming is very, VERY slowly crawling out of its casual-ripoff mire, being bogged down by gobs of indefensible "Freemium" price gouging schemes. Only time will tell if the growth produces any more meaningful concepts, or if it's just going to continue to mostly be about milking clueless slots for easy cash. Though since this market is implicitly linked to devices that require a network of some sort to function, it's safe to assume this too will only contribute towards the online-centric singularity mainstream gaming is converging towards.
-PC gaming has been surging forward for about 5 years now and is forming its own identity as something other than "The second-rate 360 port dumping ground, plus MMOs and RTSs." Though now that blunt force exploitation has arrived on the indie-kickstarter scene, the growth is going to dial back. There are some great concept titles coming out on PC from folks OUTSIDE of the AAA Zeitgeist (we don't really need them nearly as much as they want us to believe).