Windir's Poison Arrow Build [1.2] upgradeable?

Can this build be beyond viable?

I just can't see poison arrow killing beyond spawns that well is all

Hi the build looks very funny. Could a possible Skilltree for 1.3 look like this.

https://www.pathofexile.com/passive-skill-tree/AAAAAgAATDKsR1FMGYYgnOKAfVtFlussSsg_JypN8peomlpSm106Qkt43agwcdQjBbXo1iLqm7XDOspKxKKXBgX5myaiQPT4oSL-urvjgl4qW8LsQzZ59lVLYeImlRa_H0EDHgYjtUhtbMgMtNF2guOENj1n_K1KUq_Q0N1fu01irJ2qbIzvetN-fXV6U2Hrz3qyGTIB7YMZjgBeCC78xcHYqKKq-Fb6d9fWin8rTZIj9o19MHzN6jqz3Q1JE5Mf5liJ4NpilKDYTWh0-eh46-cKCpvYvTWStfJuqrTF2-dHBkp945-HdmegjFg=

Thx for tipps and hints