The hover card does not need to take focus from the mouse cursor: if you want to enter the target, the cursor is *already on the wiki-link*; the only reason to move is if you *dont* want it.
If the cards didn't focus , they wouldn't be obstructive .. you could flick the cursor through the text rapidly, *and* benefit from the previews.
Could you enable this behaviour as an option so we can at least try it out?