I always heard he supposed to come back in 2000/2001, but Vince and Co. was upset with his drug problems. Taker and all that, heard he was supposed to come back soon. Bunch of dudes believed that he was milking is his injury, some dudes didn't believe him. During his time off he got 14,000 a week.
edit: also j.r once said shawn was coming back full time in 2001
Didn't he show up to a Raw pilled out of his mind and he and Hunter had a big falling out backstage.