For perspective, those numbers are better than Bioshock Infinite's and the same as Tomb Raider's (both high quality games released before TLOU on multiple platforms). Its also won a ton of awards and Naughty Dog will hold several presentations about it at the GDC.
Like I've said before, I love how TLOU is a part of a genre (survival horror) that many retail publishers seem to have written off and I hope that some of them rethink their position on survival horror in particular and less popular genres in general.
A sequel to TLOU wouldn't fill me with rage or anything, but I really hope the team makes something original. Naughty Dog has proven repeated repeatedly that they don't need to cling to a franchise in order to find commercial success.