We have no idea what price of bitcoin will shape when Silbert's SegWit will be implemented, so estimating price of BTC after next halving is but pure guessing.
Until know I believed that price of BTC will be in range of $6k-$11k - but recent months have been crazy, bitcoin growth was almost exponential.
We might reach $3k-$4 this year already - the only problem I potentially see is FUD before forking - which can crash price a little.
According to Clif High's webbots predictions 14k by march next year and 40k after that? Maybe a year or so I don't remember the exact time line on the 40k. Video's on youtube about it..