yeah. ethereum both of them are good for a short term investment and nothing more. because they are both super risky and become riskier and more unstable as the time goes on.
Maybe this is why they split it into two seperate entities. To out source any sort of transgressions that may occur to one but not the other.
You have to be very clever to do the ETC trading. You have to sell before the Ethereum Foundation sells its ETC.
You could be correct that there may be some additional attempts at dumping ETC - which would likely cause additional ETC buying opportunities - a catch 22, whether to sell some ETC now, or just buy more ETC after or during the dump (whenever and/or if that proposed dump is going to take place).