I really mostly pay attention to the album ranks, but I'll bite.
for 00s artists:
- Radiohead will break the top 10. (5 for albums, 20 something for singles.)
- OutKast and The White Stripes will break top 50.
- Eminem, LCD Soundsystem, Missy Elliot, and Wilco will break top 75. Wilco will do it on the strength of their albums (probably breaking into the top 40), while Missy and LCD Soundsystem will on the strength of their singles (both breaking into the top 30.) Eminem's ranking will be the highest of the three, based on strong singles and album showings. (Guessing 85 for albums, 50 something for singles.)
- Arcade Fire, The Strokes, Franz, and Kanye West will all break the top 100.
- Animal Collective and TVOTR currently don't have amazing rankings, but they are both dark horses to break the top 100 when the End of the decade lists are said and done.