If metaphysics was accurate, like maths, of falsifiable like science then it will be accepted as maths or science, as it is, its just guesswork, fortune falling.
Its definition gives it as being abstract and having no basis in reality.
So you believe abstract fantasy will serve humanity better than say medical science..
Yes.
Metaphysics is just a philosophy, and it is very broad and conflicting one at that.
Broad, because it can cover both some things that are real, but others that are clearly supernatural...and that what make metaphysics so conflicting and messy.
But yes, it tends to be very abstract, which make it even more LESS USEFUL than theoretical science.
At least with something like String Theory, or Multiverse, theoretical physicists can use mathematical statements (like models or equations, hence proofs) to prove their explanations. Theoretical physics tends to be untestable - all proofs, but no evidences - but so was General Relativity and Quantum Mechanics started out that way, until other scientists found mean to detect or test them.
And sometimes it required the technology to catch up with explanations and predictions. For instance, Alpher and Herman, working under Gamow, predicted the Cosmic Microwave Background Radiation in 1948, but it wasn't until 1964, discovered by Penzias and Wilson, which verified the Big Bang model and debunked Steady State model. More recently the WMAP and Planck space probe gave us better detailed images of CMBR.
So theoretical science can become experimental science, given time and technology.
Metaphysics is overrated.