Eh, I'd much rather have an actually complete Knuckles sprite'd than a modeled Sonic. It just seems awfully pointless to put the effort in designing a SRB2-styled model for now.
Honestly, I actually prefer the sprites.
Also, Shu, how do you know? We may just make ourselves immortal. Of course, that kinda kills the point of life, which basically leads to us sucking anyways.
Also, <controversialwarning> maybe evolution will make us actually smart by then, leading an ancestor of SSNTails to develop SRB3. With newfound intelligence leading the way, it will have high resolution graphics and colored lighting.
Of course, we all know God will smite us beforehand to clense the world of dumb. I blame American and Russia. Mainly America. </controversialwarning>