Although I agree with the True Wind Rune manipulating Luc and likewise the other elemental runes having their part to play I'm confused about the point. I'm not sure why the True Wind would want to be free when it seems the runes are doing everything in their power to GET bearers, or atleast the /right/ bearers. Could be it realised Luc wasn't right and needed a way to be rid of him, this would be an amazing revelation as far as the will of the runes are concerned and would explain as to why Luc had his visions. I mean, it would hardly show him all that if he was just going to freak out and try to destroy the rune. After all, Luc was never a chosen bearer. Luc was a lovely character but he's over now, thats the way Suikoden works, people die. It doesn't seem likely we'd get another tenkai discovering the True Wind as i'm sure Konami want to keep things fresh and reveal as many of the True runes as they can before the games finale but if the rune wants another bearer, i'm sure it will have no trouble finding one. Theres always the matter of someone taking the rune away and not bearing it.
wind has always been a symbol of freedom...it could be that the True wind rune didn't want a bearer..it just wanted to be free and it took measures to make Luc do just that,remember that True runes are sentient beings....or it could be like you said...that Luc wasn't the chosen bearer and it needed to get rid of him so it can be with the destined bearer