He has considerable contacts in the business community and he should have a pretty fat bank account. He can do well for himself moving on to the next stage in his career.
That said, if he can really make $1 million in Europe, then go for it.
Personally, I think Jimmer can have a role on and NBA team. However, he needs to develop his game to fit this stage of his career. It looks like he has no idea how to be a complimentary player. I wonder if a year in the D-League would get him there.