Milo

That's like expecting a new Sonic game where Sonic doesn't have green eyes. Just a matter of redesign.

The Sonic Mania concept art bums me out on this point because

if they just kept the blue sonic color from the first two logo concepts for the final design we would had been golden

Well we had some, but they were from pre-2010 Sonic games.

But I don't think the current layout will be changed since it's recognizable from game to game. It'd be like changing a logo like Crash, Spyro or R&C's to different colors.

I quite like some of those earlier Sonic Mania logos. I've never been big on the the Japanese Mega Drive confetti aesthetic, and I personally appreciate the simpler typefaces especially when they can incorporated into cover/promotional artwork. May not be as eyecatching, but  it's way more pleasing to me to look at.

It is kind of odd that Sonic's logo inverted the colors after a while, but it is something that pops out a bit more, having a brighter central color with a dark border.

edit: despite seeing it in the OP and then looking at the prototype logos, I mistook the some of the later prototypes for the final for some reason. That being said, I still prefer the regular type ones.