Personally I've never been spawn camped even in blowout games.
I've seen one TDM that I backfilled into where we would've been spawn camped without the turrets. I have most definitely inflicted it on other teams on my server several times in TDM. It's not hard to do, and there were GSF regulars on the receiving end that didn't swap spawns, instead trying to push the kill circle around the spawn outward (and failing). I think the chances are very good that inexperienced players will simply repsawn endlessly to their deaths at the default location.
Keep in mind that "spawn camped" before this change was being killed at 11km from spawn, whereas after this patch it will literally be spawn camped, with ion aoe, drone and burst laser fire immediately on entry.