Its a possibility, but nothing more than that
And that is the beauty of the ending.
The last second of film pertaining to the Soprano saga shows Tony very clearly still alive as it cuts to black.
I agree that the final scene does allude to and arguably so that Tony MIGHT
have been killed but we simply do not know for sure. END OF STORY.
Anything other than the fact that Tony was still alive is pure speculation...and I love it that way.
For the record, Tony was alive at the end of The Sopronos - FACT
She dropped it on purpose - FACT