It seems to me that it's unlikely second rides will be available, or if they are it will be at the expense of other guests who won't get a first ride. The proslide website lists a capacity of approx 720 per hour for a hydromagnetic rocket. It may be different at VB, but if we assume that and a 12 hour day that gives 8640 rides per day. Then you have weather, downtime, and slow loadings which will all likely bring that number down some.
That puts it into the range of what I would guess daily attendance will be. For comparison, Typhoon Lagoon averages 8,000 per day when it's open, and averaging 6,500 for year round operations would make VB the most attended water park in the world.