Plantar fasciitis is like the least worrisome injury a player can have. I have had it in both of my feet at different times (I do a lot of long distance running) and it is something that you can absolutely heal from and have no lingering effects for the rest of your life. It's unfortunate for him that it is right in the middle of the season, but he is just doing what is best for treatment. You can bet if they needed him for the playoffs, he would be playing through it.