And note that there are 'beginners' triathlons around (sorry, I have no idea how experienced you are in cycling and running so they might not be for you) that shouldn't be too testing and in which people turn up in all sorts of gear and with all sorts of bikes (I've marshalled on my own running club's beginners' tri, so I've seen all sorts of contraptions!).
I think all of this changes very little. Until or unless a Salazar athlete fails a drugs test (and I bet that will never happen), this will run and run and run until the day (which might never happen) that the anecdotal evidence become so overwhelming that it simply cannot be denied any longer - a la Armstrong. What should Mo do? I have no idea. I think the best course might be to leave Salazar with a carefully worded statement that exonerates the coach from any blame but pointing out that he needs to get out of the kitchen before the heat gets too much. A shame for him, but probably the best move in the long run. (Too many 'run' puns. Sorry)
And to those who say we're all getting too cynical, you can thank people like Richard Virenque and Lance Armstrong who denied it all for years and years and years and years until eventually they simply couldn't live the lie any more. Yes, I want to believe there are world-class athletes out there who don't dope, but even for the guys we like there will always be a small corner of doubt, especially when they start getting better.
Ha, running on an obscure part of Wimbledon Common one time, I heard a rustling in the bushes and, almost by instinct, looked over - there was a poor befuddled guy, another runner I think though I turned away quite quickly - curling one off. Our eyes met momentarily, but my speed increased to spare him the worst of it. I would imagine he got caught so short he didn't have time to conceal himself properly. Nothing to do with tris, but hey.
I don't have much advice because I don't do it often, but my club does run two one-mile races every year, one on a local common, another on the track. Pacing is far easier on the latter run, as you can imagine. I think the point is everyone is different - some people need a steady pace on each race they do, some others can bomb it on the first bit and try to hang on, others grow into a race and, as you suggested, do a negative split. Perhaps you can experiment during your training? Or even just decide on a strategy for this first time (assuming it's your first). It really is a hard one to gauge because it's long enough to be irksome, but is actually over quite quickly. I must admit, the most recent one I did I bombed it and then died a little, but was still close to my PB.