You can still find square bases out there. They may not be GW ones, but they're out there.
Having said that, yes, you can sell them. Plenty of people buy 3rd party minis that don't come with bases to use for playing games that require bases. Others sell minis for those games without bases. And sometimes bases just break and people need replacements.
You might also want to store them for future need, for whatever reason. Making objective markers, terrain, basing 2nd-hand minis that didn't come with bases, etc.
If selling is too much of a hassle for the money and you're sure you won't need them, there's always recycling. But there are people out there who will want them, so that seems to be a shame, and in many places 'recycled' material is just tossed into the dump.
Up to you, really, but at least investigate selling. You might be surprised how much you'll get for the lot of them and make it worth doing.
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