BINGO...great questions!
And that's why you have to go to a reputable dealer, who is willing to write a contract that will allow you to HAVE the car if you want it, or get a full refund if you don't.
Most dealers (see the sponsors of our website) will surely be glad as heck to take the car if you don't want it... so that's not really an issue....
More important is that you have an iron-clad contract that says you WILL get the car, no matter what the market could bear, at the price quoted on the contract (which obviously has to do with "amount below MSRP" or "amount above dealer invoice").
Please note that it has already been discussed how tricky these terms can be. BE CAREFUL, and go to a dealer you can trust!