Is wearing 'No.1' a fading tradition for goalkeepers?

Throughout the history of football, goalkeepers have worn the number 1 jersey.

Originally this was because players were given their numbers based on their position.

e.g. The goalkeeper wore 1, the defenders wore 2,3,4 and 5 (assuming there were 4 defenders).

Even after this rule was taken away, goalkeepers still tended to wear the no. 1, just because they saw no reason to change.

But recently, this has changed.

If we look at the top 10 teams in the premier league, Chelsea, Swansea, United and Sunderland are the only teams in which the first choice goalkeepers wear the number 1.

And even for United and Sunderland, you could argue that De Gea and Gordon are not 1st choice (especially Gordon, who has injury problems).

In the other 6 teams, the goalies wear:

13 (Szczesny), 24 (Friedel), 24 (Howard), 25 (Reina), 25 (Hart) and 26 (Krul).

In Szczesny, Friedel and Krul's cases, the no.1 jersey was already taken, but still, if they had wanted to, they could have requested that they take over that number.

But why did Howard, Reina and Hart choose the numbers they did?

...

If you think you know why, please tell me so that I (and everyone else reading this) can know.