The old ground used to hold close to 140,000. You saw that filled out alot of games (obviously not every game), i don't see why we couldn't fill 70,000 for most games gradually over time.
In saying that, filling the corners would take us to 57,000 apparently.
It's fancyfull at best to think we would fill 70,000 other than OF games and CL games.
And I've noidea where you plucked the number 140,000 from. Record attendance for Ibrox is around 120,000.