Why didn't he "remember" until AFTER he got the money? It took him 7 years after her collapse to "remember".
If Mr. Schiavo believed Mrs. Schiavo would improve with the therapies being tried early on, then it wouldn't have fit with Mrs. Schiavo's desires to have her nut/hyd withheld atthat point. Once the therapies failed and the evidence showed how bad off Mrs. Schiavo was, then Mr. Schiavo could have then accepted the current plan of action.