Welcome, welcome... I'll just say 'ditto' to everything Dandy said

I remember being filled with panic and doubt when we made the decision to accelerate our girls. It was a torturous time coz there just aint no quick come back to "what's going to happen when x wont get her driver's license at the same time as everyone else?" etc.
All I can say is focus on the here and now... Solve today's problems and spend less time anticipating problems that might occur 10 years down the track.
The torture/self-questioning/self-doubt you're going thru will probably be very short lived. We certainly haven't looked back. While some people sprout the pros and cons of accelerating, many don't appreciate the pros and cons of NOT accelerating. Each child is different, etc. but think about what is likely to happen if you don't grade skip (?) What's the fall out going to be? How will this impact your sons/daughter's behaviour? What's the likely effect on your child's learning habits/attitude to school, etc.
Good luck, jojo