As far as I'm aware, Pigeon Point has been privately owned for many decades, and there have been at least 3 different owners. The interference with the natural landscape by the provision of an access road and beach facilities pre-dates the present owners, although the cutting down of trees, and erecting of razor-wire fencing are another matter.
The boycotting of Pigeon Point in an attempt to return it to it's original, natural condition, is totally impractical, as is the banning of people from the area. In fact the acquisition/purchase of Pigeon Point by the THA/Government will significantly increase the number of visitors, perhaps by as much as an order of magnitude, unless the THA is prepared to limit access (visit frequency) by imposing an entrance fee.
A more practical, positive approach would be to aid the regeneration of Pigeon Point, perhaps for example, by a programme of replanting of trees and foliage that have been lost, and to ensure that facilities provided, blend in, and are compatible with the ecology of the area. That should not take hundreds or thousands of years.
As regards turning it into a "Tobago Riviera", and thereby allowing to "play it's part in protecting the other more naturally beautiful areas and beaches" (you cannot be serious), I think that the biggest danger to Tobago's natural state, is tourism itself. One only has to look at what has happened to Barbados over the last 40 years.
Tobago currently has a No. tourist visitors/year per capita ratio of about 70%, and No. tourist visitors per sq.mile of 5.8, compared to about 214% and 69, respectively for Barbados, and at the present rate of tourist development, it won't take long for Tobago to reach the Barbados levels.
Therefore, the obvious conclusion would seem to be, to control, and moreso, limit tourism development; but of course tourism currently is, or at least should be, Tobago's major source of foreign income, and potential economic independance / viability, although with the increasing level of foreign ownership and probable payment &/or repatriation of tourist funds abroad, I really wonder how much Tobago really benefits/will benefit from tourism.
In the meantime, I would still recommend visiting Pigeon Point.