I never thought about that before. Did Incarnates decimate the population in starting zones by reducing the number of alts created?
By Incarnates, the Union/Defiant server population was already pretty sparse. (It's a great pity that MMOs can't generally announce a server merge without appearing to be dying and without character name woes, even though it's obvious to anyone technical that hardware simply gets much faster; I think CoX would have been much stronger if we'd been squashed together relatively cosily, seeing more characters online at any given time. The STO solution where it appears to be one server, actually a cluster instancing zones with zone chat cross-instance, seems much nicer. But I digress).
But I don't think that really happened with Incarnates because it already happened with Inventions, especially with the potential to grind for Reward Merits (Croatoa, Croatoa, Croatoa... and then ITF, ITF, ITF) and with the time potentially consumed fiddling with the market. Yes, I know I think Inventions are the root of all evil and won't shut up about it; but I think it's hard to argue that people didn't spend more time on new alts when the only thing to do with a 50 was the occasional Hami raid.