Was their any actual limit to moving Bitcoins held in Coinbase to another wallet/software? If there are why is it a problem now and not always?
Coinbase certainly has conversion limits, but anyone that wanted their Bitcoin into Dollars knew about this limit far before the warning of Coinbase only supporting one side of the split, and converting into Dollars means you don't want to risk the split and you should have been diversifying far before Coinbases announcement.
"Sending to another wallet" IS a withdrawal.