Anyway, anything could happen, since cryptocurrency is very unpredictable. But, judging how the market behaves this year, it's almost impossible for eth to climb its way up to $2.5k until december. If it happens to have another bull run, I guess eth would barely go beyond $1,000. Lets give it a couple of years to hit that $2.5k.
Apart from all this, we are free to predict anything, always think optimistically and remember we just started it all.