I reckon most of us know how you feel, we have seen similar.
I know it is a cliche but it is a very even competition. I always think of cycling which I also follow, and just how close the results of a 3 week tour are when an also-ran who is seen to have no chance in the race is maybe 30 minutes behind the winner after 3,500KMs. It is a very small margin and in elite sport the margins are very small.
After a long period without success it is very hard to get back to being a contender. Many false dawns, many signs of improvement which are close, but not quite enough. Who knows how the final step happens, there is clearly some luck involved as well as good planning, preparation, the right players etc. The worst is sitting in the middle, you look good some games and you lose a few critical games . . . and you end up without the high draft picks, frustrating.
The best thing Carlton can do is to stick with Voss for the period of his contract (presumably 5 years) and if it doesn't show signs of working then move on. I always thought Richmond were starting to get back on track when we would give a coach the full 5 years and assess at the end of that period and re-appoint or replace depending on the judgement of where we were heading. Yep, we had a few coaches who did not work out, but sacking them maybe 1.5 years into a contract was how we became so unstable, persisting until we really knew if it was going to work costs time, but you have to take the time to build to success. When you achieve it, the next lot rise up and take your place, just the nature of the beast.
DS