Maybe - and I'm just spitballing here, because I'm not a GM and probably never will be - GMBA shouldn't have telegraphed his demands everywhere in the first place. Maybe there's a difference between "here's what I'm looking for" and "here's what I'll settle for" and we don't know the 2nd part. Or maybe his ask really is what he claims it is and he might end up going to the GM graveyard holding out for it.
But when the market says "here's what we value your guy for" and 18 months later it's still less than what you think he's worth, at some point you have to acknowledge it. If your pride is so strong that you'll take nothing rather than what everyone else is offering, that's a 'you' problem. If GMBA is that worried about taking less and being taken advantage of the rest of his GM career, he shouldn't be a GM in the first place and should go back to the safety of amateur scouting.