With everything in motion set for bitcoin, any price is achievable any time now. Think that stable price after activation will be around 3500 dollar per one Bitcoin, after everything goes well with implementation of segwit. Im positive on this cuz I expect same effect as seen in Litecoin, so I dont expect for price to go down just up.
Also will this effect some alts in price, yes I believe so and expect this to happen.
This is good to find you optimistic about bitcoin in future but the truth is that you have to be get ready for any type of the situation. To be very honest I am very much confused at the moment about the segwit stuff that what will be the result of it and how will it be impacting for the holders.
Recently I read an article about bitcoin bubbles, it explains the last stage of bubble for current season yet to happen. It means we may have another round of rally too.