Well, this has taken me a lot longer than I had originally hoped for, so for that you all have my sincere apologies.
I had gotten delayed on some stuff, and then my original planned update had to be scrapped after my old computer died, but a lot of this just comes down to time. Perhaps when I signed up to do this I just hadn't realized how different my time management was compared to when I was in my early 20s. So I've been quite frustrated with myself for not having this done before now, but at long last I've gotten things together. I've updated the final post in the OP with the essential lists now having links to songs and combat demonstrations for their respective titles.
And for the final thing I've been working on putting together, I wanted to do a special list.
Since a lot of people wonder about how much things change from one year to another with regards to the rankings, and there's always a question of how well titles will hold up in the long term, I thought it would be neat to have a list that reflects all six years of the rankings. So I've created this new list which tallies up a title's ranking in every year of the Essential RPGs threads, and added them up to see what RPGs fare the best over the whole stretch of time. Since some games weren't out at the beginning, and not every title reaches the list every time, I treated anything that didn't rank as finishing one slot outside of the rankings, which isn't perfect, but it works for this simple purpose.
Here's the Top 100 by this measurement:
1. Chrono Trigger
2. Final Fantasy VI
3. Persona 4
4. Final Fantasy VII
5. Planescape: Torment
6. Baldur's Gate II
7. Mass Effect
8. Demon's Souls
9. Final Fantasy Tactics
10. Final Fantasy IX
11. Star Wars: Knights of the Old Republic
12. Earthbound
13. Suikoden II
14. Valkyria Chronicles
15. Shin Megami Tensei III: Nocturne
16. Final Fantasy XII
17. Vampire the Masquerade: Bloodlines
18. Final Fantasy X
19. Persona 3
20. Mass Effect 2
21. Xenogears
22. Pokemon Gold/Silver/Crystal/Heart Gold/Soul Silver
23. The Elder Scrolls III: Morrowind
24. Deus Ex
25. Fallout 3
26. Diablo II
27. Skies of Arcadia
28. Paper Mario: The Thousand Year Door
29. The World Ends With You
30. Mother 3
31. Fallout New Vegas
32. Dragon Quest V: Hand of the Heavenly Bride
33. Xenoblade Chronicles
34. Dragon Quest VIII: Journey of the Cursed King
35. Dark Souls
36. World of Warcraft
37. Fallout 2
38. Dragon Age: Origins
39. Pokemon Red/Green/Blue/Yellow/Fire Red/Leaf Green
40. The Witcher
41. Chrono Cross
42. Final Fantasy IV
43. The Witcher 2: Assassins of Kings
44. Valkyrie Profile
45. Nier
46. The Elder Scrolls V: Skyrim
47. Final Fantasy VIII
48. Grandia
49. Paper Mario
50. Tales of Symphonia
51. Fallout
52. Super Mario RPG: Legend of the Seven Stars
53. Fire Emblem: Path of Radiance
54. Vagrant Story
55. The Elder Scrolls IV: Oblivion
56. Secret of Mana
57. Alpha Protocol
58. Tales of Vesperia
59. Final Fantasy V
60. Fire Emblem 7: Blazing Sword
61. Tactics Ogre: Let Us Cling Together
62. Ultima VII
63. Golden Sun
64. Deus Ex: Human Revolution
65. Lunar: The Silver Star
66. Kingdom Hearts
67. The Legend of Heroes: Trails in the Sky
68. Neverwinter Nights 2: Mask of the Betrayer
69. Star Wars: Knights of the Old Republic II: The Sith Lords
70. Phantasy Star IV: The End of the Millenium
71. System Shock 2
72. Mario & Luigi: Suuperstar Saga
73. Dragon's Dogma
74. Panzer Dragoon Saga
75. Fire Emblem: Radiant Dawn
76. Baldur's Gate
77. The Last Remnant
78. Terranigma
79. Bloodborne
80. Baten Kaitos Origins
81. Shining Force II
82. Radiant Historia
83. Mario and Luigi: Bowser's Inside Story
84. Arcanum: Of Steamworks and Magick Obscura
85. Kingdom Hearts II
86. Fire Emblem: Awakening
87. Shadow Hearts: Covenant
88. Dark Cloud 2
89. Divinity Original Sin
90. Shin Megami Tensei: Digital Devil Saga
91. Lunar 2: Eternal Blue
92. Star Ocean: Second Story
93. Breath of Fire V: Dragon Quarter
94. Xenosaga Episode III: Also Sprach Zarathustra
95. Dragon Quest IV: Chapters of the Chosen
96. Suikoden
97. Lufia 2: Rise of the Sinistrals
98. Pokemon Black/White
99. Baten Kaitos: Eternal Wings and the Lost Ocean
100. Mount and Blade: Warband
You can see that some titles that haven't been around as long fall by this ranking as they haven't proven their longevity yet, but other titles rise up higher than they were in the most recent list, giving you sort of a snapshot of how people have viewed these games over a longer period of time. This year's two big new debuts, The Witcher III and Undertale, just missed out on the Top 100 based on just a single year, to give something of a frame of reference for what the bottom of the list represents.