The instant replay rule sounds reasonable.
I think the kickoff rule is pure posturing by the league. If kick returns really are "unsafe" plays, they should eliminate them altogether.
Also, I don't get the part about players no longer being allowed to get as much of a running start. How long does it take an NFL player to get up to full speed? Ten yards, maybe? So instead of reaching full speed when the ball is kicked, they'll reach full speed a second or two after the ball is kicked, and before they make contact with the blockers. Big deal.
Player safety, my ass.