You probably won’t need to do the dropper cable. It’s not like it’s open down by the BB - it’s inside a housing. Basically only if you got mud / water in at the lever. But, same goes for your lockouts if you got water / mud ingress at your lockout lever. Personally, I’m not replacing them yet, but I am ordering the parts to make sure I have everything on hand. But, if you’re already having a shop do a shifter cable for mechanical shifting (wireless here) then you could just have them do them at the same time. It’s a DIY for me so not a lot of extra effort to go back and do them when needed.
I did have to do my lower jockey wheel as well - flushed and re-packed that with fresh grease. Upper is still spinning perfect so haven’t checked it.
Suspension pivots were also a mess with mud and dirt that had made their way in around the exterior of the bearings, and I found one bearing in my linkage that’s seized. Seeing if I can resuscitate it today or if I need to order a new one. Managed to slightly damage two rubber seals that I now need to order replacements for, but they’ll be fine in the short term.
Also - you don’t need to just replace everything. You can usually use a razor blade to pull off the outer bearing seal, blast out with brake clean, I then clean with a syringe of rubbing alcohol, then blow out with a compressor or one of those compressed air cans. Then re-pack with a good bearing grease (I use Kluber Isoflex) and put it back together. A lot of times this comes out better than new as well as cheaper and faster. So far this is what I’ve done for BB Bearings and the Jockey Wheel. It’s what I’m trying for the linkage bearing today, but I need to see if I can get the right snap ring pliers to get a retaining ring off.