Hopefully but I think maybe no.
They need to get moving on something for 25/26 after Tiana.
At this point, their best bet is probably a retheme. I don't think they get the Avengers attraction till 2028 by this point, seven years after Avengers Campus opened.
If they really needed something, there's always some things I imagine Disney could do within three years:
1. Add animatronics and a new queue to Grizzly River Run
2. Put a new movie in the Muppet-Vision Theater
3. Put new walkthroughs in the Animation Academy building.
4. Replace some of the Embarcadero Gifts and Sonoma Terrace backstage area with a flat ride?
5. Retheme Monsters Inc to Zootopia or something stupider.
6. Retheme Winnie the Pooh to Zootopia or something stupider.
7. Add a third Jumping Jellyfish tower.
8. Make the Innoventions building a walkthrough where you meet an Ikran.
I imagine they could do one of these things within the span of three years.