But that's a fallacy. Most of the classic professions are organized. They're usually organized around professional associations and not "labor unions", and their collective bargaining concerns things other than their wages. But those are distinctions without differences.
Yes, tech workers aren't going to create the Tech Teamsters. That's an easy question to put to rest. But that doesn't dispose of the issue. Tech workers should organize, now, when their market power is at its zenith. There's a good discussion to have about what the resulting organizations look like.
But there's less of a tenable argument about whether they should try at all. Clearly, it seems to me, they should.