I wouldn't worry. If it is a larger hotel, it will mean more money for the local economy and probably a continuation of the improvement of the area.
Sosua is booming. Hopefully the world's economic problems won't have too much of an impact.
I would agree with you without hesitation if we had here the same unlimited beach/coast line like in Cabarete that can accomodate thousands and thousands of additional tourists.
But Sosua is different. There is one central beach and two small beaches for the whole village. And with just several hundred extra tourists a day on them the risk of overuse and polution is very high, considering that no cleanning is practically done even now.
And if it happens, who will need Sosua with polluted unuseable beaches?
So, short-term, there may be some advantage for local economy ( if tourists from this new big hotel will want to go to eat outside of the hotel). But long-term , one can see a scenario of becoming a ghost town. Another Los Charamicos.
Who really needs Sosua without clean swimmeable beach? Anyone ever saw any waste/sewage cleanning facility of Casa Marina?
EVERYTHING goes right into the sea.
So many beautiful but ecologically fragile places in the World were destroyed because of greed and overdevelopment already. Irrecoverably.
Did local populations benefit from this? Dare say - no. Money is taken away and deposited in foreign banks of the investors/developpers.
Seems strange to me that risk of overdevelopment (that can be more painful than underdevelopment) is not even mentionned on this Forum.
In most other similar places of the World plans of this big development (if it is true) would ignite mass protests of local people. Here we seem to be happy with it.