Do not fear revisiting old ideas ...
I am currently working on a project which will hopefully revive an old idea - the rationale is that it worked then and should still work. The only reason the previous project was discontinued was an outcome in a change in funding for the size/shape of programme.
Sometimes, in teaching the skillset remains for some considerable time. Even in the fast moving world of computer technology there are some base skills that remain. After all they are kind of essential.
I think that there are times where we are so obsessed with the churn of new developments - sitting back and reviving the old idea isn't such a bad thing to do. Think about your field, especially if you are in education. What old faves could benefit from revival and reach a new audience?