Everyone will be following the initial reports pretty closely. Hopefully 30 minutes means closer to an hour.
I’d bet that the key will be (as it was with EMH) to be in line waiting to get in on time - which means 30 minutes to an hour BEFORE the gate open for on-site guests. If you show up 30 minutes prior to regular park open and think you’ll have the park to yourself, you’ll find out pretty quickly you’re not very special AT ALL.
For DHS, I’d assume 2 of those rides would easily be do-able if you get there on time. 3 would be a hopeful stretch, but you would still probably have a low wait time for the third. The issue would be walk time to/from TSL and the wait times of a couple minutes per attraction adding up. You will NOT be the only one there, so thinking everything will be a walk on is a mistake. If you are one of the first ppl in, then you’ll have one walk on. Time will be precious, VERY precious, so being at the front of the line will mean a lot. Other people will know this also. I’d probably go with: SDD, RNR, then try for TOT twice.
I’ve always assumed that people TRY to get there early, but life happens, and they arrive late, or, they just assume that the park will be empty the entire time, so they show up casually without making the effort to be there on time. You have to be ready to rock on time like a warrior. My fam is all early risers, so the early am is no big deal for us. On the contrast, we’re usually zombied out by early evening, but we’re ok with that.