But a lot has changed since the remarks were made. It is not impossible to reproduce, even as a cripple. Though unlikely depending on the severity of his condition, I wouldn't count out the possibility yet.
I personally believe Jon didn't die, and will survive the ordeal. If he did, I will be gravely disappointed.
The way I see it ending is Jon as King of Westeros, married to Daenerys, with Tyrion as Hand of the King and Lord of Casterly Rock.
The binding of Ice and Fire. Ice being Jon Snow, fire being Daenarys.
Lyanna Stark is of the North, and Rhaegar is of the Dragons. A Song of Ice and Fire - I do believe Jon has the most important and singly significant role to play in the coming events, alongside the return of Daenarys.
The still fact of emphasis on Rickon, when as a minor character, he should have been cast aside by now, I do believe big things will come of him.
For the three of them, this is how I see it ending:
Bran never returns to the spotlight (albeit figured dead), I believe he will endure his Greenseer future, and remain north of the wall, with the Children of the Forest.
Rickon becomes Lord of Winterfell.
Jon becomes King of Westeros.
But, that's just my observation and opinion