Honstley, I hated hearing the "I don't WANT to use Gliscor, therefore ____ should be banned." Metagame does not orbit around what we do and do not want. There should be a solid chance for every pokemon. I am not pointing this at Excadrill, at this point I really do not care if he does or does not come back. Still, I hope next banners will consider a fair chance for every pokemon and use legit arguements.
It's not that the people didn't want to use (blank). It's that they HAD to use (blank) to counter (blank). Using Gliscor as an answer to sand and Celebi as an answer to rain for your teams would leave your team wide open to lesser-used threats like Nasty Plot Zoroark. Before Excadrill got banned, I used to have loads of fun sweeping teams with that guy because everyone was using stuff like Gliscor, Celebi, and Ferrothorn to counter weather.
Let's say a really great sweeper, for example, SD Lucario. SD Lucario is countered by Gengar, Scarf Magnezone, Terrakion, actually scratch that. Anything faster than Lucario in any way including Choice Scarf and resistant to or immune to ExtremeSpeed counters SD Lucario. Gliscor also walls it unless Lucario has Ice Punch, which I haven't seen Ice Punch on any SD Lucarios as of yet. Isn't that so much less restricting than Excadrill's few counters of maybe just Gliscor, Scarf Politoed, and a few Air Balloon mons?
Also, @Above, Cofagrigus isn't really that good. Heracross can also switch out to get rid of Mummy anyway.
This also applies to Baton Pass. The few counters to Baton Pass (Haze being the only solid one) aren't really appealing outside of dealing with Baton Pass, the only exceptions being maybe Tornadus and Whimsicott. Tornadus sucks outside of rain teams, and Whimsicott is annoying but easy to work around if you know how to do it.