That's okay 'pete' yr entitled to yr opinion we all are, I believe that cost & the fact that TCAS in a SP environment isn't the answer. No single answer will be a fix for this problem planes will continue to collide as long as mankind desires to be free of our earthly bounds it's just part of the acceptable risk.
What did we all do pre TCAS? We looked out the window where practicable & we had pilots with good airmanship/skills in the air, the latter less & less these days.
Everything about aviation is balanced against cost.
270 kts TAS/GS you guys are drawing a long thin bow there.
Wmk2