It makes even more sense to have this sort of plan in mind for the third, and possibly final, Jurassic World film, as Bryce Dallas Howard pointed out, Jurassic World 3 is the movie that will tie the history of the two trilogies together.
So, just as the story of the sixth overall film in the Jurassic series will bring the franchise to the logical endpoint that it seems to have always been heading toward, it would make sense to close out the stories of Jurassic Park characters like Alan Grant, Ellie Sattler, and even Ian Malcolm in the process.
Considering that even director / co-writer Colin Trevorrow is on record as agreeing with such a sentiment, it doesn’t feel like that’s going to be too much of an ask come time for the final script to be handed in.