In general I think, news like this are bad, (I mean, buying or destroying competitive companies), but in this situation, it's actually good news. Wattpad was in bad situation last years, they even added a lot of "paid" stuff and limited things for free, because of it. And if they would not be bought I think, they would die. So in this situation, Naver is lifebuoy for Wattpad.
Btw. Webtoon, and Tapas are both my favourites apps for reading. Wattpad is not bad, but it's just that, it's lower quality, and they lack a lot of stuffs. They have also worse community.
Well, we will see, what this will brings to wattpad, how it will change.
Btw. I would not worry about Webtoon buying Tapas, I don't think, they need it, they bought Wattpad, but it's totally different, they just wanted to expand (Not only Comics, but also Novels/Books), but because Tapas is platform, that provide things, that Naver already has, I think they have no interest in buying Tapas.