Successful Casper implementation can push it back to ATH. Since ETH is most used platform, all positive things will be reflected on the market. I hodl 
Ive heard it too,but if the lightning network will fail it is surely going to worsen the situation.The value might be decreased exponentially which is why we need to diversify our portfolio,but i believe in ethereum's platform because the team behind it is working hard,better than bitcoin's core team which cant even get the lightning network live.