I feel Suning have well and truly misread and overestimated the value of the club.
As an analogy, they looked at Lukaku's age and the offer from Chelsea and decided that a 115 million was peak money for him. They were not willing to risk a drop in his price this season resulting from Conte's departure or a weakened team. Many posters on here feel they read the situation well.
In relation to selling the club, I believe they have totally misread the situation. The peak time to sell the club was last season when there were rumours of a take over and we were the Champions of Italy in waiting. They should have taken the money (800 million) or whatever was being offered at the time.
Conte leaving, selling Hakimi, selling Lukaku and the team ultimately not performing at the same levels as the last two seasons will lead to valuations of the club being less than what was being offered earlier this year.
Essentially, if Suning thought that Inter was worth over a billion dollars earlier in the year and only 800 million (or thereabouts) was being offered at the time, it is more than likely that anyone making an offer in the future might see the club as being worth 800 million (at best) and put in an offer around 650 or 700 million.
Either way, Suning lost their chance and the knock on effect will be that Inter as a club will struggle and continue to be extremely limited as long as Suning remain in charge.