Ah, hell no, it's all negatives. It moves them from "heavy favorite" to "potentially questionable favorite" for sure. They'll have to be lucky as hell for anything good to come out of this.
Kyrie and Korver are legit 40% three-point shooters, Frye is right there if he can get on the court. Everyone else on your list is suspect when it matters.
JR is shooting 33% on ALL shots this year, and he's unreliable as hell in the playoffs. Shump has been like 28% in the last two Finals and his 39% on threes this year is an aberration - he was only 29% in the regular season last year and no one trusts that shyt come playoff time. Love was 26% in last year's Finals and has hovered around 37% in the regular season since he joined Cleveland.
Livingston and Kyrie have completely different midrange games. Livingston is as shoot in the short midrange (getting into the key and just outside it on the sides) as anyone, but he loses it the closer he gets to the three-point line. Kyrie is better out close to the three-point line and not as good inside when the long arms get active.
And why you even mention James Jones?
Steph/Klay are obviously FAR better shooters than anyone in Cleveland's lineup, and it's silly to even play like that ain't true. They might be the two best shooters in NBA history.