They were never gonna completely remake Mario 64 and then sell it as part of a collection instead of standalone. Honestly I'd rather have seen this package be Sunshine+Galaxy 1&2 and had them save 64 for an actual standalone remake. Oh well.
I'm not opposed to remakes but I still believe pretty strongly in game preservation, and honestly picturing Mario 64 remade as a modern game just feels like taking away some of what makes it... Mario 64. The weird primitive polygons, low quality textures, and empty game worlds are so much of that game's personality for me. The lack of detail leaves room to the imagination and gives it a certain atmosphere and vibe. So if there was a remake I'd still want the option to play the original.