Theoretically, this process can go on indefinitely, effectively rendering the jellyfish biologically immortal,[3][6] although in practice individuals can still die. In nature, most Turritopsis dohrnii are likely to succumb to predation or disease in the medusa stage without reverting to the polyp form.[7] --WP
Not some species, its a stress reversion that can happen in a single generation, and it isn't 'retaining their wings', its 'breeds and eats voraciously until there is no food left'. Grasshoppers can and do fly just fine even when the locust switch isn't flipped,they just don't swarm in the same numbers, and don't have insatiable hunger.