You might want to double check this list. Last I checked Goofy's Sky School is scheduled to open in mid-late December. I haven't looked at the schedule for January but I can't imagine they're closing it again so soon after a long refurb. It's Tough to be a Bug is almost always down because they use that theater for other things - it's not a huge loss IMO. Redwood Creek Trail only takes up as much time as you give it and if you don't have small children who like to run and climb, you can basically just stroll through it when lines are long everywhere else. The rides that are down don't usually have long lines, and all the rides with really long lings (RSR, Toy Story, Guardians) will still be running, so IMO the missing rides won't make that big of an impact time-wise.
For reference, we just got back from a 3-day trip. Granted, we took our time and did leisurely things like people watching and window shopping, and we took daily breaks. In those three days, the only ride on your closure list that we went on was Screamin, which only had a 10-minute line. We still had so much we wanted to do at DCA that we barely set foot in DL (we only rode Space and BTMRR). We rode RSR, Guardians and Toy Story a few times each, rode some of the smaller rides, ate food, watched street entertainment, staked out a good spot for WoC, and all that kept us plenty busy.
If you were only interested in rides and did not want any re-rides, you could probably do DCA in a half day if you get there fairly early and do back to back FP for RSR and Guardians before the return times get late, skip the kiddie rides, and ride everything else standby. But that's not what I would call a leisurely pace.
