If you've been following the Gamecom interviews then you know that A Realm Reborn runs with Onboard video. The system requirements will be drastically lower from FFXIV as they are moving to a new engine.
You are able to play with your friends from around the world in A Realm Reborn, they just have regional data-centers. Once Square-Enix updates their servers and netcode latency will not be as big of a factor as it is in Final Fantasy XIV. Play on whatever server you want, but there is nothing wrong with letting the player know where the data-center is located. Believe it or not people are capable of making their own decisions, so if you're that worried just tell your friends what server to play on.
And EverQuest has 19 expansions with enough content to encompass Final Fantasy XI at least three times, not to mention its free to play. The point isn't the amount of content, Final Fantasy XI is just a good game with a great close-nit community. The friends I've made in FFXI are still my closest friends nearly a decade later; no other MMO has done that for me.
So with those numbers you're looking at between 50,000 to 150,000 subscribers, which isn't bad for a 10 year old game. However, Final Fantasy XIV is probably sitting around 40,000 to 80,000 which puts it in the realm of EvE Online numbers. That isn't bad for a 'shitty failed' MMO right? Based on the reactions to the latest A Realm Reborn details around the web, people are excited to play and can't wait.
Your bottom line is so skewed, I haven't seen one argument support these claims but you're free to think whatever you want. I disagree with you and believe FFXIV will appeal to a VERY wide range of players, and has the potential to pull players from other MMOs very easily. Supporting a wider range of hardware specifications, and releasing on PlayStation 3 just by itself will grow the population tenfold. This regional database issue is getting blown out of proportion, and your final argument on gil reduction being done to cater to new players makes absolutely no sense.
You aren't optimistic at all, which is fine just don't say that you're trying to be when you're making baseless claims. People who aren't playing right now are excited for A Realm Reborn, I know tons of people who can't wait to get their hands on it.
I am pretty sure that was the intention at the time, make it feel as FFXI like as possible so existing players don't feel alienated. That's also why they carried over the style of the races as well.
Newer MMOs are usually the biggest disappointments in this post-World of Warcraft world. You have to remember that Final Fantasy XI came out before World of Warcraft and really streamlined a lot of the systems we were used to in MMOs. For all intents and purposes, Final Fantasy XI was the World of Warcraft of its time. Now the problem is how do you make an MMO thats not like World of Warcraft but is successful like World of Warcraft? What made World of Warcraft successful was the smooth gameplay, tight controls, one of the best UI designs, and instant gratification.
Guild Wars 2 is the natural evolution of what World of Warcraft started, and for me personally its the most casual game I have ever experienced. Neiloch and I were talking about it one day, and he said "Guild Wars 2 is like the Little League of MMOs. Everyone's a winner, everyone gets a trophy! To participate all you need to do is show up!" And he's right. I like games with more depth than a kiddie pool, I still look back on classic Everquest 2, Dark Age of Camelot, Vanguard Saga of Heroes, and Final Fantasy XI remembering the depth that each contained.
Final Fantasy XIV has depth too, it's a little disjointed at the moment because the new design team haven't fully made it theirs yet. However, there is depth there that is subtle and unique in its own way, and hopefully A Realm Reborn will retain that.
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TL;DR - A Realm Reborn will do just fine....