We're absolutely not going to build a new stadium, can't ever see us moving now (well not in my lifetime!) with the Campus directly opposite, it's no coincidence the campus and academy stadium was built opposite the ground, it's an aspirational thing for the youth so they can physically see the progression to the "big stadium".
We do have the issues with the cable roof and is why South Stand was built in such a way, am I right in thinking that roof is now not reliant on the cable and is self supporting?
If so I imagine we will do a similar kind of expansion with North stand, or as ManCityX says a completely new stand but still within the cable-net structure, and eventually do some work on the CB and East stands and get rid of the cable roof completely, but it will be done over time.
What that means for a "Dortmund wall" I'm not sure, I just think we're stuck with the cable roof for time being, certainly until after North stand expansion.
So here's a thought, if we can't have a "Dortmund wall" behind the net, lets do it to the East Stand when the three other sides aren't reliant on the cable roof, and do a proper Kippax, it was alongside the pitch after all not behind a net!