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I have seen this expression many times! Thank you for the useful feedback!

Oh, that’s an expression. If you need a lot of something, you can say: “I need all the ____ I can get.” For example:

A: Would you like me to help out?
B: Why yes, thank you! I need all the help I can get.

So, I said that because baseball in the US is declining in popularity as people spend less time inside watching a 3-hour game. So the sport needs all the superstars it can get to help maintain interest.

I have a question! Why did you put “it can get” after all the star? Even if you omit “it can get”, this sentence makes sense, I think.

Great example! Let’s hope so. Baseball needs all the stars it can get, to keep people’s attention.

“Gap” is a common word, too – “fill the gap in the market”

“Fill a vacuum” is usually for when someone has left a space open (that was once filled). In this case, you can simply say, “fill the hole in the market and reach hundreds of millions of potential consumers.”

Perfect example – instead of “someone didn’t appear” you can say, “nobody filled the vacuum…”