An analyst from Next-Gen.biz has said he predicts Grand Theft Auto IV will sell 17 million units.

“...Before the first half of 2008 ends, we can expect the release of AAA titles such as Super Smash Bros. Brawl (expected to achieve 13.95 million units of GLS [global lifetime sales]), Wii Fit (expecting 8.7 million units of GLS), Grand Theft Auto IV (expecting 17 million units of GLS), and Metal Gear Solid 4 (expecting 4.7 million units of GLS).”

If we look at TechRepublic's article on the top 25 games of all time from last September we can see that, not only is this a huge increase in sales from GTA: Vice City (the most popular Grand Theft Auto statistics wise), but also that it would be number #3 if what this analyst has predicted is correct:

1. Pokémon Red, Blue and Green (Gameboy) - 20.08 Million Copies Sold
2. Super Mario Bros. 3 (NES) - 18 Million Copies Sold
3. The Sims (PC) - 16 Million Copies Sold
4. Nintendogs (Nintendo DS) - 14.75 Million Copies Sold
5. Pokémon Gold and Silver (Gameboy) - 14.1 Million Copies Sold
6. Super Mario Land (Gameboy) - 14 Million Copies Sold
7-tie. Grand Theft Auto: Vice City (Playstation 2) - 13 Million Copies Sold
7-tie. Pokémon Ruby and Sapphire (Game Boy Advance) - 13 Million Copies Sold
7-tie. The Sims2 (PC) - 13 Million Copies Sold
10. Grand Theft Auto: San Andreas (Playstation 2) - 12 Million Copies Sold
11-tie. Super Mario 64 (Nintendo 64) - 11 Million Copies Sold
11-tie. Gran Turismo 3: A-Spec (Playstation 2) - 11 Million Copies Sold
11-tie. Grand Theft Auto III (Playstation 2) - 11 Million Copies Sold
14. Pokémon FireRed and LeafGreen (Game Boy Advance) - 10.66 Million Copies Sold
15. New Super Mario Bros. (Nintendo DS) - 10.52 Million Copies Sold
16. Gran Turismo (Playstation 1) - 10.5 Million Copies Sold
17. Pokémon Diamond and Pearl (Nintendo DS) - 10 Million Copies Sold
18. Super Mario Bros. 2 (Nintendo) - 10 Million Copies Sold
19. Final Fantasy VII (Playstation 1) - 9.8 Million Copies Sold
20. StarCraft (PC) - 9.5 Million Copies Sold
21. World of Warcraft (PC) - 9 Million Copies Sold
22. Brain Age: Train Your Brain in Minutes a Day! (Nintendo DS) - 8.61 Million Copies Sold
23. Gran Turismo 2 (Playstation 1) - 8.5 Million Copies Sold
24. Mario Kart 64 (Nintendo 64) - 8.47 Million Copies Sold
25-tie. Halo 2 (XBox) - 8 Million Copies Sold
25-tie. Donkey Kong Country (Super Nintendo) - 8 Million Copies Sold
25-tie. Super Mario Kart (Super Nintendo) - 8 Million Copies Sold
25-tie. GoldenEye 007 (Nintendo 64) - 8 Million Copies Sold
25-tie. Pokémon Yellow (Game Boy) - 8 Million Copies Sold

Now put aside the fact this lists consoles, Grand Theft Auto IV would be here:

1. Pokémon Red, Blue and Green (Gameboy) - 20.08 Million Copies Sold
2. Super Mario Bros. 3 (NES) - 18 Million Copies Sold
3. Grand Theft Auto IV (Multi-Platform) - 17 Million Copies Sold
4. The Sims (PC) - 16 Million Copies Sold
5. Nintendogs (Nintendo DS) - 14.75 Million Copies Sold

That would be quiet an achievement wouldn't it? Would be good to see other games rather than just Grand Theft Auto hitting the top of the list though, perhaps Midnight Club 4 or L.A. Noire will manage that.