If there is no anime and only live action, would it have become even more popular?

It's all subjective. Most of the anime fans feel anime is better than any live action, ever made.
Is it's just live action and no anime, it's hard to compare and imagine.
 
That's hard to say man.
There are things that can only be expressed in anime and using live action can make it too expensive for new and less budget stories.
 
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