You will come to a stop whether or not you have a drag chute. Without one, you will decelerate at 1 to 2 Gs on the salt and probably a G or so higher on pavement due to higher coefficient of friction. At Bonneville, this translates to sliding 600 ft or so from 150mph. The G force depends on how slippery your costume is and how much flailing of arms, legs, and head is done - they tend to dig in. With a chute, you have the problem of it unfurling when you are sliding chute first. It will probably wrap around you and make a nice shroud for your body - at least you wouldn't have to watch the festivities. I wouldn't trust escape capsules either - both the B58 and B70 had them. The rate gyros would lose track of the capsule orientation after a second or two and not know when to fire the chute (up or down, etc). Ivan Kinchelow got killed when his early downward-firing F104 ejection seat shot him into the ground (you were supposed to roll upside down first). Later F104s changed to upward firing seats. When in a critical situation, you don't necessarily have the time to do everything you need to. It would take a number of years of expensive design and testing to get any radical solution right and safe for the real world. This fantasy stuff is interesting since I have a lot of spare time.