I think unless FD decide to take ED down some path of competitive PvP, which would be such an epic failure even they couldn't be thinking about it, then cash for credits is no big deal.
Do I mind if someone without the 'time' to get an Anaconda can go buy one? not really, the chances of actually bumping into him with out a lot of effort are very low and even if I do, so what.
There isn't any actual revenue advantage to someone playing for a month to get an Anaconda, there is in them buying £20 worth of credits for one. Outcome is the same, one more Anaconda to kill, one more player likely to shelve ED until there is something to do with his Anaconda.
Im not sure I see much upside for FD in doing it though, plenty of people will wail on about it being the end of the world and unless its something that happens once there is a whole lot more depth to the game then I dont care.