The process of re-opening the production line would be as expensive as developing a new plane - the dies, etc. have all been scrapped.
And we CAN improve it on it - better thrust to weight, more PGMs, better all-weather capabilities, etc.
But, truth is, we might need to downgrade - we don’t need super tankbuster as much these days, as we do flying tractors ready to dump PGMs on target when called for. Quantity might be better than quality for most applications right now.
Boeing rebuilt the tooling for making the wings a few years back. And there are PLENTY of low-hours fuselages sitting at AMARG. No need to reopen the entire line, what we have would support a good sized active fleet for the next 50 years.