In fairness, the only real moneymakers from that list are Overwatch and Hearthstone. We could maybe add WoW to that list due to the die hard players still paying a subscription (if that's still a thing?) but Warcraft, Diablo and Starcraft and basically hibernating IPs at this point. None of those hibernating IPs have seen any major movement or releases in _many_ years. Starcraft is still viable as it's considered to be a mainstay of completive RTS (and therefore great for branding of Blizzard in general) but I don't think it's earning them buckets of money.
So we're down to 2 properties making the majority of earnings, both on Free to Play but not Pay to Win models. That model has a very distinct shelf life of, I'd say, 5 years before you need to either release a sequel or change it up with a new IP.
According to ACTI, WoW is making more money than ever, largely thanks to the microtransactions they added. Their subscription numbers haven’t maxed out again, but their revenue has.
I haven't played WoW in 10 years, but I know a number of people who still love and prefer the latest releases. From what I hear, there is still usually a lag when content patches stop for a given expansion, but most of the real complaints I hear about the game are from people who were on their way out of love for it anyway, whether they realized it or not. I've admittedly been tempted a number of times to play around with it, but I know it's akin to just having a beer after becoming an alcoholic and then quitting. Not a great idea.
The subscription is still a thing. I briefly looked into it early into lockdown when I was completely off work for a month and a half: they wanted 15 bucks a month, and were still charging $50 for an expansion that was about to be irrelevant. I don't know how/if they're drawing in any new or even returning players at that steep a buy-in.
WoW broke a billion dollars in bookings for 2020 according to the most recent earnings call. It's currently Blizzard's highest revenue game, and has a full size team working on making expansions for it.
So we're down to 2 properties making the majority of earnings, both on Free to Play but not Pay to Win models. That model has a very distinct shelf life of, I'd say, 5 years before you need to either release a sequel or change it up with a new IP.