I don't think if we get money from his selling that Marotta will use that money to increase an offer for a striker.
I don't see why not.
Getting Jovetic is very important for Juventus' future. Pirlo is the difference maker now, and his intelligence is unmatched by 99.9% of football players. To me Jovetic's greatest quality is his brain. He's so intelligent. He would take over the creativity duty, along with Pogba, while Pirlo fades away.
Regarding the backup position, Caceres is decent as a RB and Padoin could be as a RWB.
Litch is a WC RB for sure, but Conte decided to change the scheme and that's it. Isla was bought for a reason. Litch will definitely play much less than he deserves.
IMO even a 17M fee would do it. Getting Peluso for 1M + 6M (cover LB and CB), Armero co-own for 5M and Jovetic for 25M + Quagliarella would be awesome to Juventus.
And as Conte loves and trusts Padoin completely, who is the current backup RW, I don't doubt he would tell Marotta that Litch is free to go if that means getting his LLorente/Dzeko/Jovetic + Armero.