Sci-fi in inuyasha time-travelling,alternate dimensions, genetically increased creatures(like in Resident evil movie ) than a jevel-like bio-organic creature who has free will and can talk as well. And amazing destructive weapons. Yes it is very scientific. The well could act as a time device like a  wormhole where some people are able to pass space and time. What is this story really duty to tell a story about  scients or fairy tale or both(because this could be more future realistic :)

http://www.inu-papa.com/inuyashagoya/kiroku.html

I think I already put my say-so on this chapter. -waits for next Wednesday- 
I would say more, because I do have opinions to share with some of you, but I have a ton of homework, which means there's no time for ranting. -sob- ;_

Yamahato Yomiko: I wouldn't fret over this point too much given how he appears on the nights of the New Moon when he's fully human.

Inuyasha looks approximately 18-20, whatever. Plus the 50 years…almost 70 years old basically. Now think of this, if he used the Jewel to become human, yeah, the jewel might disappear. But think of this. Inuyasha's true age is like 70 years old! So wouldn't he become a 70 year old human? Just a thought, ya know. Then he'd die soon, and Kagome'd be all alone again, and she would suffer, thus granted the jewel's wish.

But who knows where Rumiko is going! It could go any which way! (GO INUKAG)

@Hinkypunk: Thanks for your input. But I do not think I could quite agree with some of your points, either! Certainly, if one wants, one may extract philosophy from absolutely anything around – just contemplate nature and see your path (Zen-ish…) But for Inu Yasha, I would say that those supposedly-encrypted messages are probably more results of 10 years of Ms Takahashi's pen-wandering without much maturity than anything else. And if you think the battling of Good and Evil (all conflicts in Inu Yasha are quite essentially that) is a proof of the series' philosophical level, then I would say that it seems more of a coincidence of plots that Ms Takahashi has embarked upon because it is a popular manga topic, rather than her intention to analyse it. A related Zen saying might be 'Mountains were mountains; mountains are not mountains; mountains will be mountains.'

As regards scores on the lameness scale of this development, I would say that if things go as we project then the transition would be a bit abrupt, and it is this apparent lack of style-consistency that repels me – I would not mind a lame ending for a lame series, but if someone decorates a rotting iron rod with a gold tip, my reaction would be quite markedly different.