ETH is still good, it's just a matter of time.

ETH to drop below $100, that's good, it gives an opportunity to buy again although it can't be deny that there might be a panic in the market if that would happen. On the other hand, if it will goes $600, that's also good but I don't think it's gonna happen if BTC would remain at its current movement now.
Sideways movement of BTC will not ignite a rally of altcoins, BTC should move uptrend and break its ATH, and then we can possibly see it at over $600.