It's not exactly a port, it had new content. I can see that the audience is growing (perhaps even pretty rapidly). But it seems to me that this series has a dedicated fanbase who buys all of the games, not a large fanbase who buys every other game -- in other words, the sales of P4 and of P4G were almost entirely from the same people. The total number of players of P4 + P4G isn't even close to the combined sales of the two.

So then the question is, will this dedicated fanbase buy P5 on both PS3 and on PS4? I don't see any reason to, unless each has exclusive content not in the other version. So rather than both versions getting the full sales, the total sales will be split between the two.

It's just a thought. It's also possible with Sega & Atlus pushing the series so hard recently that the franchise will experience massive growth over P4G, leading to over a million sales for P5 on at least one of its platforms.

Even though I love Pokemon that's like saying you never understood the appeal of it unless you're a 10 year old boy who likes collecting things. 

OT: I love this comparison  just because it could be either one. It's not a certainty anyone will sell better. I would have to give it to P5 though because of the edge the installbase gives.

Xeno refers to X, I just don't care enough to get the name wrong. Xenoblade was released on the Wii, while P3 and P4 are PS2 games re released on platforms that didn't have even half its install base.

Its predecessors namel w.e Monolith made, obviously I'm exaggerating, is going to determine the base of its fanbase, these aren't fresh new IPs we're talking about here, and I doubt very many people are excited because X has mechs.

Persona's fanbase is growing, Nintendo even did Atlus a favor and had PQ on the 3DS, you've got the fighters on 360 and PS3, re-releases on Vita, hell SMT works in Atlus's favor as well. The reason Persona and its derivatives have had such legs is because that fanbase is building. In Japan, UK, and US. 

One anticipated "Spiritual Successor" isn't going to outsell a sleeping giant like P5.

It wasn't just GameStop exclusive, it was print limited.

This is certainly possible. But Xenoblade had an extremely limited release in the US, and is still very hard to find. I think it's safe to say that there was demand that was not met -- so its NA sales don't accurately reflect the actual popularity of the game in that region.

Also, I think people who liked Xenoblade are among the most likely to buy a Wii U. It's been well established that it's the Wii Series & NSMB audience that seems most reluctant to upgrade to the new console. Xenoblade, having just come out a couple of years ago in America, still has a fresh fanbase. It would be a tall order for Xenoblade X to sell as well as the first game, considering the install base of the Wii U, but it's not impossible.

I believe it was both of those things.

What I'm saying is how can you say "fanbase is shrinking" when there is no statistical evidence to this claim? There is no step-event here to actually compare and say: "The second title sold less than the first, the fanbase is smaller than before or anticipated." Persona has actual itterative releases so its very easy to say: "Going by the increasing sales of the titles, the fanbase is probably growing!" It is impossible, at this time, to say the same about the Xenoblade series.

And P5 will be lucky to get a million sales, there is no "sleeping giant" here. Its a niche title.

Well, he isn't talking about the "Xenoblade" series. He's using all previous "Xeno-" games to compare sales to.

He's still wrong though, because Xenoblade outsold all three "Xeno-" games released between it and Xenosaga Episode I. It's the best-selling "Xeno-" game since 2002.

Ahh I see what he meant then.

It's an enhanced port.  The "extra content" is similar to that of Final Fantasy 4 Advance. 

You can't really argue that the people own the game on the Vita have or haven't played the PS2 version, because on one hand you could argue that the Vita has no games and it's consistently listed as one of the best games on the Vita, while on the other hand you could argue that the PSP being an RPG heavy console happened to get those RPG fans who have already played it to purchase the Vita and the same, no games, so they purchased Persona 4 since it's a good game.

Persona 5 being on the PS4 as well as the PS3 gives it the chance to get the most sales of any Persona game since the series became popular.  It's still niche, but it won't be overlooked as easily as Persona 3 and Persona 4 were being released on previous gen hardware up to two years after all the last gen consoles were released.  So this is the first time we'll see how much of a fanbase the series actually has.

Persona has the media push behind it, offcaurse it will outsell Xenoblade, but I doubt it will be the better game tho.