Would not switch, therefore staying with Nikon. But, to me, switching implies a total changeover from Nikon to another manufacturer. I'm too invested in Nikon Z bodies (Z7 and Z6ii) and lenses for landscape shooting to switch especially since the Nikon Z zoom lenses I use for landscapes (14-30 f/4, 24-70 f/28, and soon the 70-200 f/2.8) in those lengths arguably might be the best of any manufacturer available--therefore, no incentive whatsoever to change to another system for landscapes.
But, I would consider a different mirrorless brand, most likely Sony A1, for bird photography, but only if the Z9 doesn't measure up--and to be clear, the Z9 doesn't need stomp or even be equal to the Sony a1's performance, I would settle for the Z9 to initially come close to it (and to be much, much better than the Z7 or Z6 versions) especially for fps and tracking BIF. Given the stellar Z lens releases so far, I'm hoping (make that expecting) the 100-400 and 200-600 Z versions to be better than their equivalent Sony E-mount versions, so when paired with the Z9, would be killer combinations... I also would be able to use my 300 and 500 PF's (and FTZ, of course) on the Z9, two lenses which Sony has no answer for. So, I guess the Z9 would really have to fail miserably for me to think about another camera system. But, if the worse does happen, it's a possibility--but only for birding.
But, I would consider a different mirrorless brand, most likely Sony A1, for bird photography, but only if the Z9 doesn't measure up--and to be clear, the Z9 doesn't need stomp or even be equal to the Sony a1's performance, I would settle for the Z9 to initially come close to it (and to be much, much better than the Z7 or Z6 versions) especially for fps and tracking BIF. Given the stellar Z lens releases so far, I'm hoping (make that expecting) the 100-400 and 200-600 Z versions to be better than their equivalent Sony E-mount versions, so when paired with the Z9, would be killer combinations... I also would be able to use my 300 and 500 PF's (and FTZ, of course) on the Z9, two lenses which Sony has no answer for. So, I guess the Z9 would really have to fail miserably for me to think about another camera system. But, if the worse does happen, it's a possibility--but only for birding.