You shouldn't to avoid collision with FB's holding company, but you should if they and a few others are successful in propagating "meta" referring to inhabited

You shouldn't to avoid collision with FB's holding company, but you should if they and a few others are successful in propagating "meta" referring to inhabited virtual spaces, as opposed to the more disassociated concept of information connection and collaboration on which your name is based. But right now, there's really no reason they will win! A lot of negative press is going to push back hard on the new name. As others have said, Alphabet is still just Google to most people. So build your project and don't get distracted by what's currently a non-problem.