Here's a comparison of what Square Enix managed to release within 7 years of the start of last gen with that of this gen. You'll notice they still released a lot of big-budget games after 7 years had passed in both gens. Japanese release dates are provided in brackets:

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Sixth-generation: Dreamcast/PlayStation 2/GameCube/Xbox

[ Sixth-gen started in Japan when Dreamcast was released on November 27, 1998 ]

Square Enix internally developed games released within 7 years of the start of the generation:

1. Final Fantasy X (July 19, 2001)
2. Kingdom Hearts (March 28, 2002)
3. Final Fantasy XI (May 16, 2002)
4. Unlimited SaGa (December 19, 2002)
5. Final Fantasy X-2 (March 13, 2003)
6. Final Fantasy XI: Rise of the Zilart (April 17, 2003)
7. Final Fantasy Crystal Chronicles (August 8, 2003)
8. Front Mission 4 (December 18, 2003)
9. Final Fantasy XI: Chains of Promathia (September 16, 2004)
10. Romancing SaGa: Minstrel Song (April 21, 2005)
11. Front Mission: Online (May 12, 2005)
12. Musashi: Samurai Legend (July 7, 2005)
13. Code Age: Commanders (October 13, 2005)

Internally developed games released after 7 years of the start of the generation:

1. Kingdom Hearts II (December 22, 2005)
2. Front Mission 5 (December 29, 2005)
3. Dirge of Cerberus: FFVII (January 26, 2006)
4. Final Fantasy XII (March 16, 2006)
5. FFXI: Treasures of Aht Urhgan (April 20, 2006)
6. Dawn of Mana (December 21, 2006)
7. Kingdom Hearts Re:Chain of Memories (March 29, 2007)
8. FFXI: Wings of the Goddess (November 22, 2007)

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Seventh-generation: Xbox 360/PlayStation 3/Wii

[ Seventh-gen started in Japan when Xbox 360 was released on December 10, 2005 ]

Square Enix internally developed games released within 7 years of the start of the generation:

1. Final Fantasy XI: Xbox 360 Edition (April 20, 2006)
2. Final Fantasy XI: Wings of the Goddess (November 22, 2007)
3. The Last Remnant (November 20, 2008)
4. Final Fantasy Crystal Chronicles: The Crystal Bearers (November 12, 2009)
5. Final Fantasy XIII (December 17, 2009)
6. Final Fantasy XIV (September 22, 2010)
7. Final Fantasy XIII-2 (December 15, 2011)
8. Dragon Quest X (August 2, 2012)
9. FFXIV: A Realm Reborn (2012)

Internally developed games that will release after 7 years of the start of the generation:

1. FFXI: Seekers of Adoulin (2013)
2. Final Fantasy XIII-3 (TBA)
3. FF Versus XIII (TBA)
4. Final Fantasy X HD (TBA)
5. Untitled Action RPG (TBA)
6. Kingdom Hearts III (TBA)
7. Final Fantasy XV (TBA)

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As you can see, from the above comparison, it's completely reasonable and realistic to believe that FFXV will release on current gen hardware.

That's your detailed analysis?

There was more but if I posted it all then people would just see a wall of text and ignore my thread. I therefore decided to post my key argument and let people make up their own minds.

It depends on if an internal team is already making it for current gen. Motomu Toriyama (head of the FFXIII and FFXIII-2 team) has said that his team plans to move on to next-gen after their current project (FFXIII-3). Therefore, FFXV will be last for this gen and FFXVI will by Toriyama's team and be the first for next-gen.

"A detailed analysis that indicates FFXV will release on current gen hardware"

That analysis is anything but detailed. And it doesn't indicates FFXV will release on current gen harware...

the only option of it doing so is if FFvsXIII becomes FFXV

Well, as I've said, if there's a secret team already making FFXV then it could still come out this gen.

No. Their big Final Fantasy game is Versus and another big game is XIII-3. I don't think they really have room for another one. They're also working on XIV and X HD so do they really have a team for XV too?

Yeah, XIII-3, Versus, XIV and X HD... Thats enough for this gen, which will end somewhere in 2013. Especially that they showed us tech demo for next gen, which can suggest that they're making something for next gens already.

Remember when they released three original formula sequel Final Fantasy games on PSone? Those were the days.

Hiroyuki Ito (FFXII director) is working on a large-scale project for his gen. This game has yet to be announced yet so could be FFXV.

They haven't started next-gen development yet. That's been confirmed by Motomu Toriyama (FFXIII and FFXIII-2 director). He said that his team will be the first to start using their new engine for a game after they finish their current project (FFXIII-3).