I suppose all constellations will be obsolete someday, replaced by revisionists of the distant future or simply so distorted by the motions of their individual stars that retooling will be essential. For now, we've got 88, and that's the way it'll be for a long, long time.
Those 88 survived a lengthy winnowing process that ended in 1930 when their borders were set for good by the International Astronomical Union.
The carcasses of constellations that might have been were discarded along the way, but not before these "might have beens" had their day, starring in a handful of old-time sky atlases during the acme of celestial cartography in the 17th and 18th centuries.
Seeing and finding patterns is one of humanity's greatest traits, so it was only natural to look for new ways to connect stars in parts of the sky that were still wild territory between existing groups. Because now-obsolete constellations occupied relatively blank spots in the sky, they were comprised of mostly fainter stars, as the bright ones had already been used for the more familiar constellations.
Obsolete Tri Minus, Hevelius
Astronomers continued to use ancient myths as the basis for the new star patterns but also added additional, more modern, references, many of which related to then-current technology, such as: Machina Electrica, the Electrical Machine; Globus Aerostaticus, the Hot-Air Balloon; and Officina Typographica, the Printing Shop. Given a free hand in today's world, I'm certain Computatrum Novum and Telephonium Portabile would be part of our celestial scenery.
I've always pined for some of the others, if only because they represent a few of my favorite animals — Noctua, the Owl being one. I thought it would be fun to resurrect them from obscurity like the dinosaurs of Jurassic Park. By tracking them down in the present day (night!), we can pay homage to an obscure bit of astronomical history, as well as honor the memory of astronomers who tried but failed to convince the world it needed a rooster, reindeer, and royal oak in the night sky.