Here we go perfect parallel,
"Any actual numbers in SE's case would be completely out of my ass, because being a foreign company, I don't have as many friends or networked industry connections that I'd have with other companies. I used to have a lot of dev friends there, but they've all since quit after the Enix merger. So I would be speculating. They would be educated guesses, but still guesses.
That being said, let's look at Everquest and Everquest II. EQ was hovering down around 200k users (having fallen from 500k or so over time) when EQ2 was launched. It was a debacle: similar to XIV, it was a mess at launch and got awful reviews. At the time, EQ was on its 4th or so expansion. The parallels between XI and XIV are striking.
Everquest II's launch development budget was $31,280,000. (Yes, that is the exact internal number. Shhhh.) Budgets have ballooned drastically since then -- mostly in art -- so it's reasonable to assume that XIV could have cost 2-3 times that or more.
EQ2 flopped. Sony Online (SOE) had lots of money (just like SE) so they kept improving on the game over years, instead of pulling the plug. Eventually, they managed to get the game decent enough they could break even on a stable 200k users or so, but the awful reviews at release meant it would never be a smashing success. The project itself was a financial mess, and SOE never regained their place at the top of the MMO industry.
What EQ2's horrible launch did do, however, was keep EQ1 alive. It did not result in people going back -- in general, people do not go back to old games they have since moved on from. Once they've said goodbye, they are more likely to "bounce" and go to another, new game like WoW. But it kept the core EQ fanbase in that game, and for many years, EQ's subscriber numbers remained higher than EQ2's.
Both games were barely getting by. There was no massive resurgence or even small increase in EQ1's subscriber numbers. But it stopped losing users, and it made it worthwhile for SOE to continue pumping out expansions -- 17 of them! -- even if they didn't have big enough budgets to do anything major beyond more places to grind and more items to grind for." - Jaerik
http://www.ffxiah.com/forum/topic/14999/if-ffxiv-fails-what-does-that-mean-for-ffxi/4/#909118
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