Eeer, the Altmer bear strong elements of what we would consider Japanese culture, altough not entirely. Also, almond-shaped eyes.... reminiscent of the shape of asian eyes. An Asian-esque culture needs to be carefully introduced,if at all, in DA. There are many cultural elements which are quite different from the Western perspective, so I don't know how well they would mesh in a DA world. Also, ninjas and samurais is a very superficial way of looking at Japan. Strict social codes, a focus on community and working as a group, community more important than the individual, stoicism, spiritism. The Qun is quite close to these actually.
Funny, this thread is about encompassing Asian cultures/history into the game, but only a few noticed that the game already have something similar. Asia is more than Japan, China, or Korea. There are so much more to Asia and those three well-known countries, and even those countries have more than just anime, manga, ninja, samurais, and monks. They have their people, their beliefs, and their history to take into account first rather than big anime eyes, cat ears/tails (funny the people who says they don't want Asia into the game because of those things show that their knowledge is very, very limited). Asia, which have 44 countries altogether, btw, not three or four, is pretty much about community, shared responsibilities, histories of sacrificing for their countries and their people; they are about family and devoted themselves to a greater good, working hard to better themselves not just for selfish reasons, but because it is the right thing to do. They put the needs of others, of the community before their needs; and at the end of the they, they enjoy their time with their loved ones. That is Asia. Those who disdained Asia based on fox ears watches too much anime themselves and have little to no interaction with the actual people, that is why judgement is passed so quickly without much thought behind it.
As far as Asia intergration, it's already happened. The Qunary held that. Despite not having been shown much or talk about much in the game, it was already established that they are fierce people with their deep-seated belief of where they stand and how they belong in the world. They fight not for themselves, but for their people; they see themelves as both individual and part of a whole; they are strong in their convictions, but still keep an open mind; they are versatile in skills, and used whatever necessary to do what they have to do; and most of all, they work together. So, yeah, Asian culture through the Qun, except that Asians don't have horns (something curiously explained that the horned looks is introduced apart from their Ancestors). Be afraid, those who fear Asia intergration, be very afraid, it's already happened > 
Qunari invasion is inevitable XD
Asians sure.
Asian weapons and culture no.
I lol'ed hard at this. You have no idea what you're talking about, do you?