I last climbed the Tremper fire tower on July 21, 2001, about a month after the tower officially reopened. Fortunately the cab at the top was open and there was a view, although right at the tree tops. The cabs of the Catskill towers are often open on summer weekends, but maybe limited by the number of volunteers. As I recall the view was fairly obstructed by trees below the cab level. The current Catskill towers are either 47' or 60' tall. Tremper is the shorter 47' model. The Tremper summit is only 2740' and the forest is mostly tall hardwood trees.
Red Hill has a similar summit forest but has a 60' tower so has a good view. Balsam Lake's tower is only 47', but the forest is stunted conifers so has a clear view. Overlook and Hunter have 60' towers and good views. Of the five towers the Tremper view is at a disadvantage. The DEC does have the power to authorize cutting of trees in the forest preserve for the purposes of building trails and for opening and maintaining views on trails. I don't know if maintaining the view from the tower is included in that authority, but it may be worth making such a request to the DEC.