... even worse there are some players that not only wait for a tank but for a particular tank...
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There's nothing wrong with waiting for a particular tank; you just don't want the whole team doing it. Maximum effective use of a squad is to have a wide range of 'products' to eliminate the enemy; which includes the rare ''tank killer" vehicles. On several occasions, I've seen it take 3-4 minutes for a squad I joined - to organize. However, once the proper vehicles were chosen, we wheeled out together and wreaked havoc on enemy positions.
Often I have asked at the start of a game (with the 60 second lead/wait before everyone can enter the grid) to use a particular vehicle, and have had little opposition (this usually works on more organized servers). If you prove effective enough, you usually don't get a bunch of no's (negatives).