The following image sums up my feelings and that of mai waifu's:
Although rumours are going around that the manga is going to be cancelled, we cannot be sure that the author and artist are the ones who intend to end it. Furthermore, I have always thought that To Love Ru is a little too fanservice-y to be in Shounen Jump, so it is possible that said title is being transferred to some other, more appropriate, magazine.
Last but not least, to can a manga which does relatively well in terms of tankoubon sales is a little unusual. After all, publishing companies depend on tankoubon sales to reap profits, according to a report I read.