Absolutely HODL ETH for long time or atleast till POS is implemented. Nobody knows how POS in ETH actually work I mean the staking rewards what if its Good enough? So start accumulating the ETH as much as you can. Project is also going good so there is no need to worry about the prices much in the short term, think it as a buying opportunity. Worst case scenario it'll be a good hedge against Bitcoin in the long run.
But why would you accumulate now and maybe find out later it's not worth it?
There's people with 10000 eth, eth devs have millions (wasn't there like 77million in circulation already before anyone else even received, bought or mined coins), those are the ones that will really profit from POS. Not someone with 5 eth.