The problem is, IMHO, nobody will cross-shop this with an X5. The X5 is in a totally different universe, badge wise, and frankly, content wise.
The best comparison is a Lexus RX, which maxes out, at $68k, per the Lexus website. And the RX has a bulletproof reputation, despite the outrageous styling of the current model. The RX is probably the peoples choice of the moneyed class in a lot of communities
So $59.9k, fully loaded and maxed out, is probably the best they expect to command, in the current environment, and $52k-$57k would be more realistic, me thinks.
Lincoln and Cadillac used to be the heavyweight champions of the world, along with, arguably Mercedes. But for so many years (decades??), they stopped training (trying), and grew fat and stupid. Now they want to get back in the game, but they need to train extra hard, move up in the rankings, one step at a time is how it's done, take on all the challengers (Audi, Lexus, BMW) and hope for a title shot. That takes time and BTW, when you are moving back up through the ranks after getting fat and complacent for so many years (decades) you can't get away with charging the same price as for a title fight, because the throngs just won't pay. You can only ride your reputation so long, and Caddy and Lincoln rode them for too long, so they must now fight their way back up the rankings, and I have no doubt that they can, but they can't charge premium prices, because they simply aren't title contenders - yet.