We all know that the two rivers is special. Becasue of its isolation the Old blood there has remained pure but now that all of the refugees have gone there it has become a multicultural place. Do you think that this will cause the two rivers to become just like any other town?

Your question is too vague.  All towns/places/etc have something that is different from others.

Also, there are also other 'special' places besides just Two Rivers.

 

If you are asking if the Old Blood would become less, that could be likely.  Though there could be the possibility that Perrin's group of Two Rivers people would return and settle in again; after Tarmon Gai'don is done.

 

I don't really think that the Two Rivers will become just another town. The refugees and outlanders that move in seem perfectly content to just adhere to the Two Rivers lifestyles. Also, I think that after TG, the Two Rivers will be the next Manetheren and one of the few stable nations, so in that aspect they would remain unique.