Yes, this was always the intention with River City; Goldberg designed this as a street running through the building.
However, it doesn't bode well that Lendlease made no attempt to connect River City with Cooper at the north end. Currently there's a
fence/retaining wall and about a 6 foot elevation difference with no way to connect through. At least River City is now converted to rentals, so in theory a smart landlord would recognize the value of a Riverwalk connection in adding value to the building and especially its long-vacant retail spaces. Back when River City was condos, there was no way the HOA would ever support strangers walking through the lower level. The current landlord is probably holding out for the city to pay for any connection.