IMO, that's a good development. I hope it lasts.
Moralizing arguments such as this one are FUD.
The Phillippines has the opportunity to deal with their relationship with China themselves, or the US can whisper in the ears of its leaders to take certain actions, making promises to them that make the offer all but irresistible.
The way you framed your comment makes it seem like you think the Phillippines is what, too noble of a country to bend under US influence?