In this clip he say's "The ideal thing would be that the dolls came to life so they wouldn't be dolls anymore."
However, he loves them because they are dolls. If they came to life they wouldn't be dolls anymore.
If they came alive, they might demand more attention than one is willing to give. I would not want mine to be alive unless they were alive only when I wanted them to be. But then I project lifelike essence on them when I play with them, they are alive in my imagination as much as I want them to be.
Phil