Wildly overstating it's importance.
It's almost 150m back from the edge of the bluff, and in fact the ground slopes down towards it so it's around 10m below the edge of the bluff. You could probably build eight stories here before it's even visible from 30th Ave in Roxboro, and that's ignoring the plentiful mature tree canopy. From the Elbow River at 26th Ave in Mission, in theory you could see anything above around five stories built here, but in reality the large houses in Roxboro and the trees mean you typically can't even see the bluff. In fact, here's Mission Road heading southbound approaching 30th Avenue. If you look on the horizon just to the right of the dangerous and meaningless "share the road" sign, you might see that the horizon is a little flat. That? Is an eight storey apartment building; actually one of a complex of four, built right on the edge of the bluff -- not well back from it. And note this is without leaves on the deciduous trees. If someone were to propose 30 stories here? Sure, that's a big building that will stick out. But anything that is feasible will be basically invisible until you turn the corner halfway up Mission Road (or turn off Macleod), but if we start worrying about people being able to see buildings when they're within a block of them, then we've got a lot of buildings to rip down.
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It's not on a busy road, it's on Mission Road, which is about as quiet as a road can be and still actually connect places in the inner city. The last count just south of here had around 8,000 vehicles a day, two-way. Of course, this is a road in a long standing community and so I would hope that the long standing character of the community should be acknowledged -- Mission Road had 11,000 vehicles a day in 1987, so it could handle almost a 50% increase and still be within long standing community traffic volumes. The traffic flow maps put out by the City don't label roads with volumes this low, so it's hard to find a direct comparison, but Memorial Drive in Sunnyside has high-end residential along it and four times the daily traffic volume of Mission Road. 5th St and 8th St both have higher volumes south of 17th Ave than Mission Road; Elbow Dr has twice the volume.
"The welcome mat to Mission?" Get over yourself. Let's just say I'm shocked that you revealed this potential development site is
In
Your
Back
Yard.