Yep, The Magic Kingdom has gotten shortchanged
twice now in terms of recent major additions (and more specifically roller coasters). TRON basically suffers from the same main problem as 7DMT. Both had the potential to be great, if only they were a little longer and had a little more stuff going on. Imagine, for instance, if Tron had cut the outside portion (which as you said messes up the continuity/immersion), and instead spent that money into multiple launches and other effects...
@_caleb I think the issue is that the attractions you listed aren't intended to be e-tickets (well, Rocket Rods, but...). Also, unfortunately, Tron's outdoor visible motion actually detracts from the thematic integrity of the area (IMHO), because it features a "naked" roller coaster track.
But despite these drawbacks, I'd still count Tron as a net gain. It's fun (especially in the back at night), and the canopy is cool-looking. The problem is mainly just that The Magic Kingdom will
still be in need of a true e-ticket to continue staying ahead of (or keeping up with!) the competition.