$15k? That's too much to speculate even Bitcoin do even hardly reach out those ranges again.I cant deny that ETH is really a good altcoin for long term but reaching even $2k-$3k would still takes time.
If you do know the recent news of ETH when they are going POS on next year then we might see some change of trend of the price.It might rise but on the current system would really prone to manipulation.I don't even know if that would be a wise decision.