This is not going to happen, the price is never going to have the same marketcap as ADA or just ETH, forget about this because it is not going to happen. This coin is super hyped, no one cares about vechain, the only ones buying it, are just doing it for profit purposes.
"Looking at NEOs marketcap, Vechain would be $20
Looking at ADAs marketcap, Vechain would be $95
For a long shot price target we could take Ethereums marketcap which would bring Vechain at $350"