charterdriver, if your question “there would have to be enough runway to stop at V1???” relates to my comment on the PSM+ICR report that some aircraft did not stop from an RTO initiated at V1, then you may conclude that either the calculation of V1 was incorrect, the safety margins involved with V1 are marginal, and/or the crew employed an ‘inappropriate response’ i.e. did not follow the required procedures. Unless we can determine the reasons for the first or last alternatives, you cannot apportion blame; the industry has to seek the reasons why the crew behaved as they did – CRM, Human Factors?
Thus just because a pilot has decided to stop doesn’t necessarily mean that the aircraft will stop in the distance remaining; that requires additional and correct action. So in practical terms when defining V speeds, there is a need to explain all of the associated activities and assumptions.