What is ‘sustaining the game’? You mean ‘multiplayer community’? Yes, obviously people playing multiplayer did that, needless to say.
For ones designed with MP in mind, and earning money through MP means- sure.
You’d have to define a success of a game. For the vast majority of titles, even ones heavily focused on multiplayer, it’s equals financial success. AoE III doesn’t feature monetization, especially tied to multiplayer, which would contribute to such a thing.
It’s important for every part of the game to be well-made, popular, and well-regarded. When a game features a multiplayer mode, it’s obviously a good thing when said scene doesn’t completely die. And on PC in good games they rarely do, as long as game creators don’t deliberately aim do do so by various means.
This game, AoE III and 3DE were designed to be no less diverse and balanced when it comes to gameplay value than Age of Kings. It’s much closer to the middle of the spectrum than AoE IV or ofc AoE Online.
Sadly things didn’t go super well, ES was shut down, SP never reached its full potential for many tech/design/financial/policy reasons, but that doesn’t automatically translate into game being carried over and surviving on a single string called ‘multiplayer’. It’s more a stroy of underwhelming scenario creation tools/campaing offerings than strength of MP, which even when peaking never came close to overthrowing 2 which cemented itself in the golden age of PC RTS days.
I’ve played couple hundreds of hours of MP in the original AoE III, but even more skirmish with testing various mods and overhauls and while visiting various fan sites and forums people like that, and ones not caring about MP, always appeared to be a huge percentage.
Of course even mediocre multiplayer has the potential to vastly outlive singleplayer, that’s the nature of the beast. Again- needless to say. But it’s a fragile thing and relying on it is a gamble and a reason why countless games died and are forgotten.
In AoE III people would likely say it certainly does not, because of how lacking singleplayer offering was and for the most part- still is. But in the end a copy sold is a copy sold, and it’s a well-known fact that most people don’t seriously engage in multiplayer. And certainly not for longer periods of time, and even less in more competitive and classic forms of it, and in its core AoE 3 is a very conservative take on the formula that largely, despite all awesome additions, is the same thing as in previous installments.
Devs did a solid job but 90% of the effort was channeled into the support of that classic core- more maps, more variety in cards, native tribes, revolution etc. Things like Tycoon mode came very, very late, things like challenge score mode are a stump that is more like a proof of concept than expansion in a new direction.
For people handling the money and making all the decisions, a person that buys this game for campaigns, mods, skirmish and a person that buy this game to play with friends online in a clan, is equally valuable. And so far there’s nothing suggesting multiplayer-focused people came even close to being a majority of consumers buying a copy of this game, and all expansions.
Skins are valued, and bought, by relatively few. So when it comes to ‘supporting the game’-paying the bills, it all falls into: people buying the game, people buying the expansions. And since most are not interested and/or don’t stick with MP (that doesn’t generate the money itself) for a new player if turns into ‘value for money’. 3DE is amazing, support is amazing and devs delivered so much free content it causes headaches, but when you calculate $ per campaign, meta SP offerings, the situation is rather dire.
I’ve played thousands of skirmishes, spend many hours creating maps, and testing out mods. But especially these days people like that are a minority. Kids don’t do things like this without added layers of progression, skill trees, growing hero characters (hell, Relic did that in Dawn of Wars II years ago), some persistent bigger sandbox modes a’la ‘Galactic Conquest’ from Empire at War etc.
Grinding skirmishes, with poor AI, is for old-school RTS fans hopeless AoE3 lovers and people that have no choice because they love civs/historical setting. Grinding rank in the classic RTS competitive formula was and still is for few in the grand scheme of things and that’s a dead end in the current market. AoE IV won’t reach 10m sold copies anytime soon…