I think that the sense of urgency is just being realized right about....now. Seriously. I don't think that anyone in a position of power at Disney felt that any kind of response to Uni's redo/expansion was necessary. Then, 2 things happened. Firstly, Disney execs have just started to realize exactly what Comcast is doing, and how it will affect their business, and secondly, the success of DCA after the makeover showed that spending money provides a great return on that investment. (That should have been seen from what happened at Uni with WWoHP, but perhaps nobody was paying attention.)
The fact that Disney Springs was announced this year and, as reported by Spirit and other reputable insiders, that additions are planned for the next 4-7 years (Star Wars Land? Cars Land? Pandora. Imagination redo. New parade) leads me to believe that some urgency is beginning at this time. I don't know how many of the aforementioned projects would have had any chance of being greenlit without competition from Uni.