Realistically its easier for Inter to find an adequate CB to replace Bastoni than it is to find a young FW who is certain to score 20+ goals to replace Lautaro Martinez.
Selling Bastoni for 70m~, but extending SDV and getting bremer for around 30m is much better than selling Lautaro and getting either another dinosaur has-been in the dzeko mold or overpaying for an unknown quantity like Scamacca. I understand the sentimentality about getting rid of a young italian, but in Inters situation a young defender like bastoni is a luxury, while a 20+ goal forward is a necessity. The former is easier and cheaper to replace than the latter.
Though in the end i fear both Bastoni and Lautaro will likely be sold. Selling both for a combined 150m€~ would allow Suning to bank the 80m€~ to cover depth. Then allow Perisic renewal (a huge mistake imo, despite his excellent season) and the salary to sign the injury prone Dybala and possibly Mkhisaurus, even with the reported 15% overall salary reduction. Then there should be leeway to invest in a new forward as well, hopefully not another dud like Correa.
Either way, rough time ahead for Inter surely.