Of course Ethereum is still suitable for investment. It will grow, it just needs time .
It seems to me that so far the stability of the crypto-currency market and coins is not being discussed. Especially the etherium does not have the same stability, but it is really a promising platform and a coin with which you can multiply your state.
I think it's not for nothing that the etherium team is announcing the introduction of new technologies that are aimed at scaling the block chain. This, in turn, will lead to an increase in the capitalization and popularity of this platform.