If this works as hoped it wouldn't necessarily replace Ptap or SRM. My guess is it would really put the hurt on SRM more than Saris, but it would be a serious challenge to both of them in a very limited market that's hungry for a more reasonably priced solution. The projected price of Vector is $1,000 without a head unit, which would then add $400+, So it's not cheap, about the same price as a Powertap hub, but without the weight penalty, and with the major advantage of being able to use any wheel set.

IF the Vector lives up to expectations, who would want to lay out $3000+ for a crank set based unit that's much harder to transfer between bicycles and offers no real major advantages? SRM would have to cut their prices substantially. Big 'IF'.

If I were SRM and Saris I'd be wary of this, but it was inevitable, they have ridden this limited technology wave and charged high prices for several years, it couldn't last forever, even in high end cycling products.