Absolutely not.
It was either demote pluto as a planet, or accept we live in a solar sytem with hundreds, maybe thousands, of 'planets', which is what would inevetably happen if we had kept the definition as is. Such as Charon, which has over half the mass of Pluto.
Pluto is now a dwarf planet, as are other Kuiper belt objects, and that is right and proper.
As knowledge increases, sometimes paradigms shift so that the overarching order still makes sense.
Charon is one of Pluto's four moon and we have known about Charon since 1978. I remember seeing a picture of it when I was a kid in the 1980s. It looked like a bulge because the best telescopes of the day could not fully resolve it. Objects like that are usually discovered by their gravitational effects on other objects (or other means), long before we are able to photograph them.
Another object now classified as a "dwarf planet" is Ceres, which was discovered in 1801, along with the asteroid belt between Mars and Jupiter shortly thereafter. Astronomers have known that there are thousands of objects in orbit around the Sun for a couple hundred years, long before the discovery of Pluto.
Astronomers first hypothesized the Kuiper Belt in the 1930s just after Pluto was discovered, and by the 1960s there was mounting evidence of its existance based on measurements of mass in the solar system, etc. This was long before they "discovered" a lot of Kuiper belt objects with telescopes beginning in the early 1990s.
It probably makes more sense to classify Pluto with the Kuiper Belt objects, but the issue is not entirely beyond debate. For one thing, you can see Pluto in a good backyard telescope. You cannot say the same for the other Kuiper Belt objects. Pluto is still the largest Kuiper Belt object. Sure, Eris is more massive, but it doesn't share Pluto's reletively circular orbit, and is not classified as a Kuiper Belt object. Eris has a highly elliptical orbit and spends most of its time beyond the Kuiper belt.
It took astromomers quite a while and much debate to come up with a definition of planet that they could generally agree upon.
Sure, our knowledge of other objects in the solar system expands as we discovered new objects, it is an ongoing process. Not an overnight discovery or paradigm shift.
What changed most was out attitude about how we wanted to define a "planet". But how is that so much different than the Empire's attitude about the divinity of Talos changing?