Posted by: Lava1964 on 2016-02-27 
Trying to prevent erosion is basically an impossible task as erosion will always occur. Erosion can certainly be slowed but it can never fully prevented. One of my high school geography teachers told my class that nature is always trying to flatten out protrusions via rain, wind, and running water. I always remembered that comment.
Posted by: Lava1964 on 2016-02-27 
Apparently erosion at Niagara Falls--not specifically Horseshoe Falls--is occurring at a slow pace. this is what I found on a website pertaining to that topic:

Accurate surveys of erosion of the Falls of Niagara began in 1842.

From 1842 to 1905, the average rate of erosion of the Horseshoe Falls was 1.16 meters (3.8 feet) per year.

From 1906 to 1927, this rate of erosion was reduced to .70 meters (2.3 feet) per year. This reduction coincided with the large quantity of water being diverted for hydro-electric generation.

Today, through increased water diversion and anti-erosion remedial steps, the rate of recession at the Horseshoe Falls has been reduced to a fraction of what it used to be. Today it is estimated that erosion of the Horseshoe Falls is less than one foot per year. In the future, through remedial efforts and further water diversion that the amount of erosion at the Horseshoe Falls has been projected to be reduced to approximately 1 foot every 10 years.
Posted by: Bluey on 2016-02-26 
Meanwhile Horseshoe Falls eroded at record levels.