No you wont win if you keep picking up the flag and exploiting with sprint to an unreachable position and camping there, the objective of WSG for you as alliance is to pick up the flag and run with it to your base not stay in the horde base.
you can then cap the flag if you also hold the alliance flag
To sum up you do not win by holding the flag as long as possible, like this post if it helps you win future games <3