Your proposal is exactly Aristotle's alternative to Parmenides's flat, actualist understanding of being, "never shall this be proved that things that are not, are", that landed him with collapsing everything unto the One. For there can be no passage from one to many. It is still reflected in, predominantly extensionalist, modern interpretations of modal logic in terms of possible worlds, that simply posit many side by side. For modern exponents of Aristotle's view see How does the concept of the 'virtual' (Deleuze) relate to 'counterfactuals' (Lewis)? Lewis advocates the more common modern solution that replaces potencies with counterfactuals, sentences about what is not, but might have been. In another world, as flat as Parmenides's. It is not so much a solution as a workaround, we get to talk about capacities as alternative actualities, but not to explain how they are present here and now, as potencies. Here is from Felt's Impossible Worlds:
"The shadow of Parmenides seems to lie over these discussions. For whether with Lewis one takes possible worlds to be as real as the actual, or one tries to replace them solely by the actual, the upshot seems the same: all is reduced to a planar understanding of what it means to be. In these controversies the anti-Parmenidean (Aristotelian) notion of potentiality, as an intrinsic character of the actual, has tended to be supplanted by possibilities (in the plural)...
[...] The link between Actuality and Possibility lies not in possibilities but in potentiality. This potentiality is grounded in the actuality of the settled past and in the dynamic actuality of present process. Thus the new actual is always growing out of the womb of the potential, but the potential is itself rooted in and structured by past actuality.
The actualists are therefore right in denying an independence to the possible. On the other hand, to be potentially is really a way to be, even though it is not to be actually. And this of course is just what Aristotle said in response to Parmenides, who conceived of only one way of being, being in actuality."