Would you like Luffy to follow in Shanks' footsteps and leave the Grandline before his final onslaught of the One Piece to get some nakama from the other blues' first?
(of course i don't know why Shanks actually came to East Blue, one can only assume it's as his superior said, and Shanks actually went to see what's colder the north pole or south pole, exploring the world. all in all, speculation. but the question remains, should Luffy explore the world or just go straight for the New World?)