Agreed, flying down spider berm going 15 miles an hour and running into a trail runner in the other direction would be pretty serious. Probably should put a giant sign at the new trailhead explaining the rules and highlighting the double track-only rule while pointing out the fancy hiking facility down the road on the other side of the preserve.
I think this new trailhead will work out great overall once we all get used to it. Still more remote than Alafia, and the location will promote a stacked loop system with green quads, woods trail, and meadow intermediates closer to the trailhead and Abyss and Ridgeline still somewhat furthest away. I will miss the two track, but will probably ride the quads more as a warm-up or cool-down. I'd like the trailhead to be as remote as possible and much more primitive than Alafia still, other than better parking. If you want to have a picnic and go straight to some blacks for fast laps, go to Alafia, if you want to go ride in the woods for miles and enjoy nature, go to Balm. The spirit of each should stay the same as it's own niche to keep our double-whammy of MTB jewels intact. Everyone hates change, but it will turn out fine I'm sure.