In Universal's case, B&M's are less likely mainly because they are fairly set in how they do things. They are going to do it their way because they know what works. Intamin will pretty much build whatever you ask for, delays be damned. If you want a multi launch coaster with backwards sections, B&M probably would just turn the job down or price it way out of reasonable range. Since Uni seems to be going towards more launched, sensored, and other specialized coasters, that kinds knocks B&M out. If Uni decides to build a Hulk/HRRR type, exposed steel coaster at the third park, I'd be surprised if it was anyone other than B&M.
I doubt we see an RMC at Uni. A wood coaster probably will never happen, and the RMC all steel stuff is just too new and low capacity. But for your average regional park, you are right, they are doing things no one else is right now.