From the city, I'd advocate a linear connection from 17th St SW to 19th St NW, under the CPR/C-train, over the river. That would bring a fair amount of Hillhurst within walking distance of Sunalta Station and create a new corridor from Lion's Park to Sunalta and the Beltline.
Overall, my main concern is who will pay for the stadium. It's my position that those who will profit from more boxes and concessions ought to be the ones to front the bill, whereas things that benefit the public are fair uses of tax money. For instance, the city could pay for infrastructure in the WV and amateur facilities at the field house. The city has already paid hundreds of millions for the WLRT and will have to spend much more on new roads and infrastructure to develop the neighbourhood.