My wife's family has suffered with MS (killed her grandmother and a couple uncles obviously show signs) so I kinda get that feeling. Long term degenerative diseases are the pits. But you never know. Smarter people than me are working tirelessly to attack them and DNA research is getting better all the time.
We conquered Polio and it wasn't so long ago Tetanus killed guys from a shaving nick. Jack Daniels died from a toe infection. And even if we just eradicate one of these horrible diseases all the funding and research can move to the next one. I'd love a letter from the MS Society telling me to keep donating even though we cured it because they are directing funds to other diseases.
It's cold comfort when you see people suffer but the long view is very hopeful. One day we'll talk about cancer the way we talk about TB.