Personally, I think Nas dropping a double album in 1999 would've been met with the same criticisms. Even with the tracklisting, there's still some filler and commercial reaches that would've caught flack. There would've been added pressure because in '99, his double album would've been compared to Pac and Biggie's doubles. As great as the concept looked on paper, I don't really see critics gushing over the execution.
Best case scenario is that Nastradamus would've had a stronger tracklist and he still dropped two separate albums. He could've had I Am... be more personal with songs like "NY State of Mind Pt. 2", "Project Windows", "Belly Button Window", "Drunk By Myself", "Undying Love", "Poppa Was A Playa", etc. Nastradamus could've been more reflective and conscious with songs like "Ghetto Prisoners" and "Find Ya Wealth". He could've even added more storytelling songs like "Small World" and "Blaze A 50", which would've strengthened the album.
Personally, this is how I would've done it:
I Am...
1. Belly Button Window
2. NY State of Mind Pt. 2--- street single
3. My Way
4. Project Windows--- 3rd single
5. Sometimes I Wonder
6. U Gotta Love It
7. Poppa Was A Playa
8. Second Coming
9. Hate Me Now---- 1st single
10. Hardest Thing To Do
11. Rise & Fall
12. Drunk By Myself
13. Undying Love
-Bonus song:
You Won't See Me Tonight- this would have been a single complete with an Ancient Egyptian themed video to reference the album art.
Nastradamus
1. Amongst Kings
2. Self Conscience
3. Nas Is Like
4. Come Get Me
5. Wanna Play Rough
6. Blaze A 50
7. Small World
8. Favor For A Favor
9. Hustlers & Killers
10. Pray
11. Find Ya Wealth
12. Ghetto Prisoners
13. Last Words
Two separate albums instead of a double disc.