White Labs certainly seem to have been having real production problems this year. One imagines that the diastaticus thing at the very least prompted a whole lot of cleaning that might have disrupted things a year ago, but it seems to have been ongoing since then - seasonal/Vault strains coming out late, wholesale orders not being filled completely, that kind of thing.
I've not been aware of Wyeast having the same problems, but I (and the people I talk to) don't use them so much. One could imagine that in both cases, all their energy would go on keeping the "core" strains available, but the others might get put to one side for a bit. Put it this way - if they don't keep WLP001 and 1056 going to commercial breweries then they no longer have a business, homebrew 1028 doesn't matter so much.