Third, you can't predict 10yrs down the road. No one can.
Well, I predicted correctly 1 day down the road: their new car bug leads to a new car lease request.
FIL went out on his own new car shopping trip today. He went to a dealership and got all excited about a new XSE ($26k, instead of the $15k Camry we were looking at yesterday, or the $8k Hyundai I proposed) that cost $259 a month with 2600 down for 36 months. He then told my wife that he want us to contribute $100 per month as $8k / $26k would be about $100 a month. Wife knows not to promise anything and tell me to call him.
I called him 3 hours later, he was "asleep" and MIL picked up the phone.
I told her that my initial offer was to help them secure future travel expense for at least 15 years, not to enable them to get into financial uncertainty. So I told her I would not be able to contribute if they are financing or leasing a new car, but I will be glad to help contribute $8k to any car they are buying with cash. He took over the phone and said they need to put one car under my wife's name so they can be qualified for low income health plan assistance, and see if it is ok or not. I said it is ok by me, and then he hung up on me.
If he is not an entitled snow flake, I don't know what is.