The problem isn't the combined limit, it's the hard limit on Vendor IDs at 65,535. Since very few companies have 65,535 products, almost all Product IDs in any

The problem isn't the combined limit, it's the hard limit on Vendor IDs at 65,535. Since very few companies have 65,535 products, almost all Product IDs in any given Vendor ID namespace are unused. That is the maximum number of organizations on Earth that can be issued a USB Vendor ID until the spec is modified. They'll likely introduce a special Vendor ID that indicates to clients they should look elsewhere for the real (and longer) one. While the rules were more lax many years ago, and some vendors are grandfathered in and can therefore share their Product ID allocation, these behaviors are explicitly prohibited by the USB-IF for newly issued Vendor IDs.