Ohh, I thought you knew something I didn't.
TBH, thw way things are going, I doubt there will be a big turn around. In the last year alone, vBulletins market share of commercial forum software has went from 68.3% to 57.9%, a 10.4% drop. Also, the percentage of vBulletin installs that are running vB5 is only 1.4% which has only increases about 0.5% in a year.
Now take into account that there is quite a few sites out therre running vB5 in the cloud, they can't use mods on their sites, like you could running it on your own server. So those users will never need mods that you might like.
Bottom line is, there are less and less users using vBulletin over all, and the amount of sites running vB5 is dismal. If they were to clean up the code so it was not such a mess, and add the hooks system back in, like it is in vB3 and vB4 series, perhaps a few people will develop mods for vB5, but it will not be like it is now.