Jamal Adams is one of the best defensive players in the NFL, and there's no question he would be a major upgrade for the 49ers if they somehow were able to acquire the All-Pro safety.
It would be tremendously difficult for San Francisco to fit Adams into the team's current financial structure, particularly given the expected drop in the salary cap due to the loss of league revenue resulting from the coronavirus pandemic. Not to mention, the lofty acquiring cost that likely would include a combination of players and/or draft picks.
The chances are less than slim that it will happen, and the 49ers won't make the same mistake the Los Angeles Rams did in selling the farm for Jalen Ramsey.