there are examples of abandoned games getting new update out of nowhere by miracle (curse of pleasure for example) , so you could say its better to leave the game rather then making it shit. But I dont know if I really agree with this as it breaks my heart to see good game getting abandoned where you had high hopes for it (like that one Hand Drown Naruto game, I forgot how was it called, it had original characters as MC, and god tier animation.) So its sometimes bettet to do short but sweet game, end it and let players move on rather then make them forever sad over what it could have become.