Honestly, if Lego could just use the "anime" shorts to promote action figures like Star Wars is with Galaxy of Adventures, I'd be even more on board...
than I already am. I think choosing to finally try 2D out is a fantastic choice on Tommy's part, and by all means should aesthetically boost the show as a whole. Ninjago's 3D animation (and arguably its story) has still been well above its quality as a glorified TV commercial, even in its lowest points (like HoT: that flashback Time Twins fight remains one of the better action pieces in the series), and I doubt this'll detract from the show in any meaningful way, outside of the current outrage over "anime bad, get out of my (notably eastern-inspired and culturally hinted as Japanese) Lego show," which is very likely just some Watch your language. -Eljay xenophobic instinct from the concerningly impulsive fanbase.
But then, all fandoms tend to have some distinct levels of toxicity, do they not?
Edit: Thanks, Eljay; forgot where I was.