I don't recall that line?
But if it is in there, I don't think it changes the fact that Bioware doesn't need to explicitly state who will or won't be seen again. I doubt they'd back themselves into that kind of a corner.
Unfortunatly for bioware they did just that. Because da2 was rushed they never really thought it through thorougly.
When Casandra Said gone just like the warden along with leliana replying it is no coincidence bioware brought the warden back unintentionally.
In hindsight you can argue that was not the case. But it really was that message.
That the warden and hawke would team up. For the next game. A correct assumption for a poorly executed ending.
Besides replacing the warden with stroud is just a cheap unimaginative idea. Like replacing messi with a player from the junior soccer league