So as we know there is some drop in raid population and might be a good idea to have something to easy in people into raiding.
Something along the lines of hope in get slapped with all the training golem buffs + some stat buffs ( when the build templates come out suggested builds feature) , and get reduced number of rewards for it compared to the real deal. The other option is to be 25 man with the same scaling of the bosses in the instance.
Also this could work for first tier fractals.
Also to point out having more casual people raiding , would mean more need for new raids, since it will be a more prominent feature for the game.