Music Star had it way worse than v4 when it comes to the shut down, since you can't obtain two special characters on it anymore.
Well, there's not much we can do about it though. I honestly doubt Bandai will ever revive them. Just asking nicely isn't enough for a big company to do something this big for just a small group of fans that aren't even the target audience. We'll see what the future holds though, if they maybe finally stop hyping up the vintages and remember that connections have some nostalgic value to people too. But otherwise, it's better to just forget.