I love wikis, used to use them to keep my data, but I suspect it would not work on Evernote for a few reasons:
1-All the wiki links I have ever seen require the source and destination to be in the same physical file, and while I am not sure how Evernote Notebooks work, Evernote note links don't care where a note resides.
2-Evernote notes are automatically titled by the first line until the title is edited, messing with this line always broke the wikis I worked with before, not so with Evernote.
3-I think Evernote search indexing would be seriously affected by a switch to wiki style linking, because in Evernote, a link cannot be created until a new note is created and saved, so it seems to me they would have to somehow recreate how Evernote works from scratch.
On the other hand, I can think of a least one very good reason for wanting a wiki style link system:
I exported all my notes from my usual account, then imported them all to a backup account. Not a single note link was preserved, which kind of begs the question of what is the backup even for!
If I used this backup to restore my usual account, it would probably destroy all my note links, which took literally years to create and organize, across several software platforms and devices! Yes, it was a wiki system before I moved all the data it to Evernote . . . .