I am sure as soon as Kentaro Yabuki finishes with Darling in Franxx, he and Saki Hasami will start doing the sequel To Love-Ru.
The authors themselves said in their interviews that the manga To Love-Ru Darkness ended, but not the manga To Love-Ru.
Kentaro Yabuki and Saki Hasami made many references to the continuation of the manga To Love-Ru in the manga To Love-Ru Darkness.
Manga To LOVE-Ru Darkness chapter 77--Let's Meet Again Sometime ~I'm Looking Forward to Our Future~
The name of the chapter is likely teasing for either a sequel to To LOVE-Ru Darkness or a completely new series from Kentaro Yabuki and Saki Hasemi or exactly the continuation of To Love-Ru.
The last page of the Special has the words "Here we go again.". This may indicate that a sequel to To LOVE-Ru Darkness is planned.However Author stated that the darkness has ended but not To Love-Ru.
But on the last page of chapter 77 , Momo said "And so, mother, our days of love trouble are set to continue.", with "love trouble" written as "To LOVEる" in the original Japanese release.
This is only a small part of the references, but they directly say that there will be a continuation. At the end of the manga To Love-Ru Darkness were the words of Saki Hasami, I found their translation - It says that Saki Hasami had to finish the manga To Love-Ru Darkness, but he said that the end of To Love-Ru Darkness does not mean the end of the manga Love-Ru - these are his official words.
Kentaro Yabuki also wrote his words at the end of the manga - He also wrote that it was necessary to finish the manga To Love-Ru Darkness and that if possible, he would not mind to continue the manga To Love-Ru --- are also official words.
Making a conclusion, I can safely say that it is worth waiting for the continuation of the manga of To Love-Ru — this is confirmed by the authors and various references, I am sure that the continuation will be after Kentaro Yabuki finishes with Darling in the Franxx.
