No it doesnt. Redefining how we see things is good, it's part of classification systems and a dead classification system means a world that isnt expanding scientifically.
And by no definition should they be considered a triceratops. Triceratops was simply one of the best/longest known species in said group. Calling a another species in said group a triceratops is like calling lions a type of leopard.
Pluto also was excluded from being a planet based on the altered definition of planets. It got bumped out due to new ways of thinking, it doesnt deserve anything and I strongly doubt its feelings were hurt by this decision.