We already have a term — "gas giant" — for the category of objects you propose. There are a limited number of reasons to prefer one usage of a term over another. One is closeness to an original meaning; the original meaning of "planet" is intrinsically geocentric as neuro42 points out.
Another is current common usage; this could mean either common usage within the astronomical community, including the idea that a planet is overwhelmingly the largest object in its orbit, since the asteroids are already excluded, or the vernacular meaning whose exact semantics is vague, mainly rooted in the explicit list of planets we learned in school and with the proviso that other objects "like those" would count as planets if discovered.
A third reason to prefer a usage is usefulness, and this must always mean usefulness to some users of the term. Yes, Earth is puny when set beside the mighty Jupiter. Should we then defer to the inhabitants of Jupiter in all questions of terminology— oh, right, as far as we know Jupiter is uninhabited. The question then becomes, which meaning of this term is most useful to us in our current situation (where our situation is taken to include the existence of documents which employ the term in the senses in which it has historically been used up to now)?
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Another is current common usage; this could mean either common usage within the astronomical community, including the idea that a planet is overwhelmingly the largest object in its orbit, since the asteroids are already excluded, or the vernacular meaning whose exact semantics is vague, mainly rooted in the explicit list of planets we learned in school and with the proviso that other objects "like those" would count as planets if discovered.
A third reason to prefer a usage is usefulness, and this must always mean usefulness to some users of the term. Yes, Earth is puny when set beside the mighty Jupiter. Should we then defer to the inhabitants of Jupiter in all questions of terminology— oh, right, as far as we know Jupiter is uninhabited. The question then becomes, which meaning of this term is most useful to us in our current situation (where our situation is taken to include the existence of documents which employ the term in the senses in which it has historically been used up to now)?