If specific nodes do get overloaded, SPF and Sender-ID both let you use a short record pointing to a longer record somewhere else as a band-aid.
That's a fine workaround, but even *those* records will get caught by wildcards. Wildcards won't work.
I don't see how repeating this claim makes it any more persuasive. All the records I know about can use the short pointer band-aid, and it looks easy enough to have five or six band-aid records and still fit in a UDP packet. What am I missing? I realize that a hundred TXT records won't fit, but I don't see more than about four TXT record applications showing up any time soon.