Have you played drg at all recently? The lvl up system is very nice, the wyvern is not useless before it lvls. It still has a lot of survivability without it. You no longer need to fight anything to lvl your wyvern up either. If your wyvern is constantly dying you are doing something wrong.
The job isn't played as much because jobs like war and drk can out DD us easily. I've seen drk's putting up 7-8k+ resolutions in VW, wars similar with other ws or higher with resolution with mighty strikes in addition to the DoT they already do. Best I've done in VW with stardiver is a little over 4k while some drks can avg 5500.
Not that I am saying the Call Wyvern timer shouldn't be reduced or eliminated(which I doubt considering bst and pup) but your reasoning's aren't valid anymore. Llester brought up the real reason the timer is a huge annoyance now.
Edited, Oct 4th 2012 4:28am by heldemon