Using 7th or even 8th Ave subway seems impossible without converting to HF trains, right?
Crazy idea:
SE GL moves to 12 Ave, probably gotta be a shallow UG station at arena. Then it connects with the red line underpass and switches into the municipal building tunnel.
But then it forks again to run WNW diagonally across Olympic Plaza for a terminus, leaving the straight 8th Ave ROW for HF trains.
View attachment 598895
Now it's likely a forever terminus and North is a separate line, but it wouldn't be totally impossible to connect them by running a few blocks up 1st St SE (construction disruption would be unpopular) then turning west on 3 Ave.
With the small empty parcel north of the NE corner of TCC you would have about 250 meters from the Muni Building (maybe even more considering the front plaza/sidewalk in front of west entrance)
Of course you'd have to tear up Olympic Plaza and turn 12 Ave north of Stampede into a construction zone........
What am I missing here...this seems kinda brilliant?