No Nintendo franchise dies even if it sells badly ... it is just parked waiting for better times or a period where they have no ideas for new ip
Look, I know we don't want to give up on a new F-Zero, but it's competing with Kid Icarus for "longest timeframe between Nintendo sequels", man.
Anyway, my take: Nice to see Advance Wars back. Giving the characters more animations is all good but the style could dial down the "Live2D VTuber" aspect a bit.
I think the reason people find the "plasticy" artstyle jarring has several possible explanations:
1) Actual army figurines you may have gotten as children do not resemble these chibis. Of course, the "Army Men" games and "Small Soldiers" are way closer to actual army toys for kids people in America are familiar with. Perhaps "Knockoff G.I. Joe" may had been preferable if they wanted the plastic toy look, but it would be too drastic an art deviation to the classic Advance Wars.
I feel like Advance Wars' style update should have resembled western WWII propaganda cartoons - particular the infamous Private Snafu;
You can kinda tell in the way the soldiers animate that they might be TRYING to go for that, but the animations are not quite having the slapstick umph they should just yet .That's because...
2) The 3D animations look kind of unpolished as of the previous trailer. I'm remembering the scenes with the Mech infantry in particular; the way they fired their rocket launchers looked like flash tweening, which is silly in a 3D animation. It can definitely be improved upon. Maybe they should get the guys who worked on Batallion Wars to handle this, as I think for whatever flaws those might have had, they did the "western war cartoon in 3D" style a lot better.
3) The anime artstyle COs and their tall, lanky builds clash with the chibi soldiers in a more obvious way when they're portrayed in two completely different artstyles. You can no longer imagine Andy or Sami in the same screenspace as the infantry they command. This was not as obvious in the GBA versions, because there the artstyle was dictated by the hardware and screen space limitations, and COs rarely animated outside of face portraits.
4) Remember Days of Ruin? Even though that was a major tonal change from the previous Advance Wars games, the art style didn't deviate that far from the previous entries. I can't imagine them trying to do a DoR remake that looks like THIS, though. It'd be so wrong!
Bummer about the delay, but I hope that means the graphical issues are being ironed out.