Partial disagreement
A rarity between us, I'll admit, Dan... however:
If you meant his dreams of personal corporeal immortality (assuming he had them), then you are of course correct.
The immortality of his name is guaranteed, certainly by his earlier "Golden Age" fiction, if not the latter, less coherent works he's needed a co-author to help him get through (regarding the senility question, I began to have my suspicions right about that time).
Add to that the credit he gets, and deserves, for envisioning satellite communications, and the inevitable spacecraft which will bear his name...
Cheers,
E'