Perhap
Perhaps you're right; I'd certainly like my unease to be unrealised. As you say, it's still quite early in the design process, and concept art can be deliberately vague, so we'll see how things emerge as we get closer to opening day. But the widespread belief that the BTTF coaster must hit an actual 88mph and Universal applying for a height limit of 115m is what prompts my concern. That's significantly faster than Velocicoaster, and more than twice the height. Twice as tall as Velocicoaster! I'd have been much happier to see a decent size coaster weaving in and out of a massive show building, which would allow for fully immersive story-telling. Instead the concept art suggests a massively tall outdoor coaster, perhaps with a couple of vertical spikes, and an indoor load/unload. Very Merlin, perhaps; not very Universal, perhaps.
But I fully accept that it's too soon for any definitive commentary on what Universal will be doing in that part of the park.