I can buy the Trojan horse theory. However, how will these coins be merged? Is that even technologically possible?Once enough people are familiar in using different digital currencies they will "regulate" the industry and convert all of them into 1 "official" digital currency. The great returns you are seeing now are just to bait more and more and more people into familiarity using them with bitcoin leading the way.
And even if it is, maybe instead of merging them all into Fedcoin, they simply tax Bitcoin and the others out of existence while Fedcoin doesn't get taxed at all.