I'd think "easy" is the relative term here.
Dansby's really solid - at times spectacular both defensively and offensively - but is far from irreplaceable IMO. The Freeman situation was different because you needed to replace him with a legitimate middle of the order bat, and given their ages Alex probably HAD to replace Freddie with Olson if the plan was to lock the entire core up (as it appears now to have been). Dansby's different - for as good as he's been in his career year, this is still the first time he's had much success hitting near or at the top of the lineup, and you've already locked up a potentially better fit for the #2 hole hitter in Harris. An Acuna/Harris/Riley/Olson top of the order is just about as dynamic as it gets, and having d'Arnaud and Contreras available to split time behind the plate and at DH while having Ozzie return to hit between them makes this group arguably as dangerous as anyone offensively.
I'm as old-school as it gets at times, and think having Dansby in the clubhouse is a BIG bonus - just not one I'd substantially overpay for. Aldemys Diaz and the other SS we're watching in this series will come MUCH cheaper - Diaz is as good on offense as Dansby, and Iglesias is still a defensive wizard who doesn't have the contact issues Dansby has exhibited many times in his career. Either of those guys would be perfectly fine as replacements hitting in the #8/#9 hole (which is probably where Dansby belongs when his bat regresses) if Alex would prefer to avoid another $100+ million deal that would give him more flexibility to spend on arms as he potentially has to replace Jansen and Morton.