Will this be the case like what happened to halving Bitcoin where price predictions were very high but have not yet been reached? Many experts predict the chance to make the market of ETH increase in certain percentage. Of cours,e it may have chance for it. however, it is no need to only pay attention or believe at all on the hype and also price prediction. Once you lay in the price prediction, you may hurt when it doesn't fit yet.
Personally, I also expect that the ETH testnet will really bring benefits and also easiness. However, I personally don't expect too much about the increasing market. if the price is really increasing, it is a bonus for me. But if not, I think that we should think about technology and future investment.

Become stable? Seriously? I don't think that ETH wil become stable. This will be still volatile although it may not high enough compared to the other coins in volatility. Therefore, better to make the market price increasing significantly although slowly but sure. That is our chocie whether to sell or hold this coin. In fact, ETH is much worthy coin to invest or even for traidng.