Why not extend the lagoon and use the boats for Cabana??? Like wouldnt that make the most sense?
Here's a reason it would be best to extend the lagoon:
Consistency. Consistency is something I value a ton. In my opinion, it would be best for Universal to extend the lagoon for guests at Cabana Bay. While it is expensive and could shut down a road (unless there's another option I'm just not seeing on a map), it would keep guests from getting confused and everyone will see it as being really convenient. Just because this is sort of a value resort doesn't mean the guests staying there shouldn't be able to ride boats to the parks and City Walk. -- That's my reasoning, though, I
can see both sides of the argument.
Here's a reason they won't extend the lagoon:
Capacity. I believe it's been stated that Cabana Bay will have more rooms than any other Universal Onsite Hotel (please correct me if I'm wrong). Because of this and the pricing, more guests will be staying at Cabana Bay than any of the other on site hotels. Because Cabana Bay will be the farthest away, and because there will be more guests traveling from Cabana Bay to the parks, then it will take a lot of time to transport guests, therefore testing their patience. It also means that Universal will have to spend more for fuel, and possibly buy another boat and hire more drivers. Or, they could replace the boats with a fleet that has a higher capacity.
Extending the lagoon is expensive - but in the long run, Universal will gather more expenses by having a lagoon.
As much as I hate to say it, I think Cabana Bay transportation will either rely on busses or some other form of mass transit that will be really unique. Hopefully, Universal will find a way to make it extremely clear to guests that the boats won't take some of them to their hotel.