200K seems a long way to go with just slacker/PayPal backers and 450K seems impossible.
Still 1½ months left on the timer and I believe those Portal/PayPal backer numbers will pick up once they manage to link up Fig with their backer portal as that will allow people to upgrade their pledge with addons.
They should be able to hit that 4,75M and who knows how many people will pledge more once they are remotely close to 5M.