I really dislike Simons at Prada, but I don't really see who else would be more suitable take over after Miuccia.
In truth, this feeling extends to lots of these late 70s/80s/90s semi-intellectual designers, like the Dries Van Noten, Walter Van Bierendonck, Ann Demeulemeester, Martin Margiela, Helmut Lang, Yohji Yamamoto, Rei Kawakubo, (John Galliano would've been part of this list if it wasn't for LVMH), etc.
They're too subtle, multifaceted and they lack the "iconography-by-numbers" element that their mid-century predecessors have.