That's stretching it a bit. Just because more than one person hits upon something doesn't mean it's obvious; and as we know, it's much easier to understand a working instance of something than to discover/invent it.
So we need something to get around the problem of 'see new thing - figure it out - declare it obvious - sue to overturn patent'. Maybe the proposed first-to-file requirement will help that by taking the patent office out of the history-investigation business and just acting as a recording service, letting the parties fight out their dispute in court; I hope so. But it's hard to come up with some catch-all definition of what constitutes 'obviousness' because that will always be open to both honest and mercenary dispute.
So we need something to get around the problem of 'see new thing - figure it out - declare it obvious - sue to overturn patent'. Maybe the proposed first-to-file requirement will help that by taking the patent office out of the history-investigation business and just acting as a recording service, letting the parties fight out their dispute in court; I hope so. But it's hard to come up with some catch-all definition of what constitutes 'obviousness' because that will always be open to both honest and mercenary dispute.