The issue isn’t the cut scenes, but that it’s possible to dash through a dungeon like a madman, which is ludicrous because you no longer have anything remotely resembling gameplay.

If someone is in a cut scene, then force fields need to block progress, whilst swarms of mobs continuously respawn in order to entertain those that are waiting. Fundamentally, people just need something to do.

Or instead of mobs, setup a row of those “test your strength” games from the Golden Saucer, and give a reward to the player that obtains the highest score before the cut scene ends.