I know that a lot of laptop hdds go out because they don't get properly cooled. The SSDs consume less power, thus create less heat.
That vibration for the hard drive must be while operating, as most of them can do something like 300G with the heads unloaded. I doubt that the SSD becomes more durable while it is unused, so maybe it'd be more likely to break more when dropped (any decent modern laptop has accelerometers to park heads when 9.8m/s^2 acceleration is detected.)
And if you want a laptop that will last, jsut buy a nice one. My Fujitsu ultra portable has been going strong for 3.5 years, and it was in my lightly padded back pack during a few bike and skateboard accidents, plus I've stepped on it a few times and put thousands of miles of airline and train travel on it.
And everyone that I know that owns a Dell laptop hasn't had it last more than 18 months without a backlight, battery, power supply, motherboard, keyboard, or touchpad going dead.