Of course he will become a serious threat again. It perplexes me how still people think Nadal is done.
Because some people round here cannot see past the immediate.
They see what's happening NOW and they project that into the distant future - they seem to forget that tennis is always changing, that there are high points and low points for every player and they don't last forever.
This time last year, Federer was widely thought to be on the slide, he was permanently dismissed as a contender for the French Open and people even doubted he would make it to 15 slams. Well we saw how that worked out.
People thought that Nadal would ride high on the top of the rankings for a long time once he got there...well we saw how that worked out - he'll likely be #5 by the time the French rolls around.
I could go on.