Dota 2 and CS:GO are the only titles Valve has put out in some time, and I'd argue they're not the best examples.

Valve has been throwing money and man-hours at Dota 2 relentlessly, but the game's playerbase is still tiny compared to LoL. I imagine they have only a couple more years to try to figure this out before the gaming zeitgeist moves away from traditional MOBAs completely.

CS:GO has been in an alternating state of either complete neglect or completely tone-deaf changes. Most patches from recent memory have been despised by the community and quickly reverted. The game seems to be the red-headed stepchild of Valve properties, run by a skeleton crew of people who don't really understand the game.

Meanwhile, Blizzard just blew the doors off the market by revitalizing a game format that Valve invented. I suspect there is a huge internal struggle at Valve right now to determine whether the company will be a content producer or a platform.

You are hugely underestimating the size of Dota2. It is insanely profitable and benefits from having a more mature playerbase, which comes with disposable income.

While I don't know much about CS:GO, you seem to be incredibly ignorant and/or misled on the state of DotA and TF2.

I disagree at least on one point - I've also played Dota a fair bit in the last few years, and as for Dota, I think parent might be pretty on the money when they say games are moving away from traditional MOBAs. The format is great, but in its 'traditional' form (three lanes, jungle, etc), there's only so much you can do with it. I think the market is pretty ripe for innovation on that format, and Dota won't be able to keep up when it happens.

I also agree with parent in that 'Blizzard just blew the doors off the market by revitalizing a game format that Valve invented' - I honestly think it's hard to argue that point. Overwatch is conceptually very, very similar to TF2, and must be doing some damage to its playerbase (though I haven't checked any stats on that at all so I might just be talking shit).

Isn't that what Heroes of the Storm is though? It doesn't seem to have been very successful at pulling players away from Dota.

True, but I still think it can be done better, and the time will only get more ripe for it as more longtime players quit (source: all my friends quit Dota and we've been playing since beta or soon after).

I don't play TF2 much these days, but from what I've been hearing/reading, a lot of people in the community are dissatisfied with the recent update and yes, some are leaving TF2 to play Overwatch.

Wake me when they divest themselves of their hats.

Dota is over 13 years old by now and still growing. It may have less players than League, but it's by far the most popular game on Steam. I've played it for over 10 years myself, and I have a very long friendlist of similar people. Dota is a lifestyle, it's more addictive than any other game and people keep coming back to it even against their own wishes. Valve has been drip feeding people with Dota updates since its launch and I don't expect it to stop anytime soon. Claiming that dota will die in a couple of years should be taken with a huge grain of salt.