I don't believe we're moulding science to better fit history and public thought by altering the definition of the word Planet. As we make scientific and technological advancements it seems inevitable we will discover far more of these objects orbiting further out than that of Pluto, having a definition we can apply at the very least allows the astronomical community to either distinguish or deny Planethood. This is of course very important and if it should increase the number of orbiting 'round' bodies in the Solar System what's the problem. I don't feel public opinion is being taken too seriously, after all will the average person really mind how many icy planets there are, its not like they're going to be interested in taking a vacation there.

Debate is good on the subject, so is the public voicing their opinions, but lets just get some perspective, it is only a definition.