No they wouldn't, because you are not a giant corporation like Apple. Stop assuming your scrappy little startup and a trillion-$ corporation with massive market share have similar interests, this is like an ant worrying about a fence designed to block elephants.
In reality if you come up with some kind of better plug, you will sell to a specialist market that would recognize the benefits (dentists or musicians for example) and then expand into other markets. You could try selling direct to consumers but guess what, nobody would buy it unless it had connectivity with other devices, and manufacturers wouldn't go out of their way to adopt it unless it delivered overwhelming advantages at low additional cost.
In reality if you come up with some kind of better plug, you will sell to a specialist market that would recognize the benefits (dentists or musicians for example) and then expand into other markets. You could try selling direct to consumers but guess what, nobody would buy it unless it had connectivity with other devices, and manufacturers wouldn't go out of their way to adopt it unless it delivered overwhelming advantages at low additional cost.