SAW is still viable but he now definitively needs his team late game. He can no longer do as much 1v1, mainly because of the nerfs to his range and the dmg of his B.
I would give his abilities low WP ratios as well as having CP, and increase the dmg of his B and C. That would give his WP path some viability from a distance, while leaving his CP path the pure makeshift assassin that it kinda is, and give his CP path wider leeway when it comes to building CP items. Right now, as CP SAW, you have to build too many dmg items to make his kill time as effective as other late game heroes, which, combined with his slower speed and lower defense, makes building any kind of defense or sustain on him both a necessity and a losing battle. Not to mention to use his A effectively you need some kind of defense. I would also lower the cooldown on his B a little. He already has enough penalties on him through his makeup. He should at least not have to wait so long to use the ability, especially since not only is he stationary the whole time, any kind of stun makes it nearly wasted. He should at least have a chance to use it again in a reasonable period of time.
SAW is currently relegated to the likes of Churnwalker, in that he is almost a completely team centric hero at this point, where as before, with enough skill, you could do quite a lot of carrying on your own, even though you had to constantly put yourself in dangerous situations.
At the least, I would give him some of his move speed back. The way it is now is utterly ridiculous unless you build boots, and SAW’s dmg is already low enough without items to be wasting a slot.
As for WP, again, with his lowered basic range, he really needs some viability to poke from a distance. Even if they didn’t give him WP ratios on B, a longer slow would help him close in on enemies while also keeping him safe if he’s on the defensive.
Another idea would be to at least give him some fortified health while using his A or B.
He literally has no help in his kit to help him survive without his team other than his A, and his dmg, and that’s not quite fair to a hero who struggles to even get into range now. Yes, his immediate range is a death trap, but he has to be able to do something outside of that or at least have some kinda help to get him in range of enemies safely.
Even churnwalker has some help with his defense & health, and building proc builds on him gives him some killing potential. SAW doesn’t have any of those options available to him.