Time to give my obligatory thoughts on all these proposals.
#1 (Brass Amplification Limitations): Yes! Hopefully the voting membership will finally see the light on this issue that has been apparent for a few seasons now.
#2 (Evaluation Structure Innovation): Interesting idea, although I would prefer if there were still adjudicators for the Monday-Tuesday shows, but only a small (5-member) panel of judges with no scores. Also, the DCI Tour Premiere should still be scored as a regular weekend competition, IMO, even though it's on a Thursday.
#3 (Guard Sheet Reinforcement): Not my area of expertise, although I will add that Michael Cesario said back in 2016 that colorguards should not be judged by their "effect," for whatever that's worth. But I see where they're coming from; it's a different age, even from just 4 years ago.
#4 (Any Instrument Policy): NOPE. They will lose me as a fan if this happens. The only way I can see this working for me at all is if they limit the number of non-brass/percussion players at any one time. It will be even more egregious if they decide to go ahead with this full-stop for 2020, unless they can get a corps or two to "trial" this proposal.
#5 (Live Sampling): As long as it's used primarily by soloists/small ensembles only and not by the whole ensemble (see #1), I'm down. After all, I loved when the Bluecoats got away with their "looping" effect in 2015.
#6 (RSTF Voted On Every 3 Years): Probably a good idea for the organization, although it doesn't matter to me (or any of the fans, for that matter).
#7 (Scoring System Update): To be honest, I could see this passing if DCI goes ahead with #4, or if they're OK with limiting the panels for weekday shows in #2. But as it is, it's OK; it reminds me of a similar proposal that a former SCV director presented a few years back. Also, I'd prefer this system be trialed at early-season or smaller shows.
#8 (Sound Reinforcement): ####, totally forgot about this one before posting! Well, I get where he's coming from. I still would absolutely prefer #1, though.
TL;DR I like #1 and #5, dislike #4 (unless there's a way to make it work without sacrificing the essence of DCI), and am neutral on all the others.