Seeking the current situation anything could gonna happen. It may uptrend to 3500$ if not face any further difficulties. But still looking to the present scenario it seems quite unpredictable.
Maybe yes att the end of the year, But it should also be kept in mind that in this year the price jumped from $1k to what is today, For that reason can not completely rule out a decrease in price,IMO if it is maintained close to the levels of $3k is a sign of solidity and stability.
By this year end only $3500 ? I do not think so. I guess where we had started this year will not be significant enough to decide where we are going to finish up this year with respect to bitcoin price levels.
After segwit activation I guess there will not be any hurdles bitcoin will be facing to have huge prices like $10,000 levels. Yes, I am expect prices to reach $4000 to $5000 before end of August month and then prices to test $10,000 levels by end of this year.