We put off a trip we hoped to take a few years ago until Galaxy's Edge was open and then life changed significantly for us and we won't be able to make a trip to Disney until 2022, by that time it will be 10 years since our last Disney trip. As someone said above, Disney rolls things out like this on purpose so there is always something new to see. While I would love for Guardians to be open next year for our June vacation, I'm not changing my plans if it is not.
Honestly, I already feel enough pressure about getting a Rise of the Resistance boarding group, I can't imaging my anxiety if I have to worry about Tron and Guardians as well!