We do all want different things and I am sure Disney is keeping an eye on what its fans want. Whether it be here, in game or on other fansites, i'm sure they will be earwigging.
The 3 things you list Angel have all been mentioned at various GM events, so at some point they will arrive in the game. But that will be at the RIGHT time and not before. Personally I love the invasions. It's an excellent time to get good rep, level up those weapons and work together with other pirates who you may even become good friends with. Next will be the Tortugan Invasions(already on test), and it was also mentioned that Padres will have Jolly arriving there too! ( I think I have the chat logs somewhere hehe
), along with new clothes and new weapons (plural) So, more things coming to these shores soon. Remember, all good things come to those who wait. lol.
I don't think POTCO will die off, especially with word of the new film. Peoples interest will be awakened again, and hopefully those who have taken a break (for whatever reason) will be tempted to its shores once again.