To be honest if they dont people will just quit. Look at the already dead rbg community. If only <10 ppl get HotH every season nobody will even bother with that bracket anymore. I know some ppl that really played their hearts out this season and should have gotten their first glad. But this is really demotivating. Making titles so rare will make them very prestigious for sure but that will demotivate new players to even get into pvp.
What pvp needs is a matchmaking system like every other game has. Casuals need an easy way to participate not the LFG shit.
They also need rewards. 2k for the elite set is already ~95th percentile. So 95% players wont even get that. And besides rival and challenger the elite set is the first real reward while climbing the ladder. Also no tabard and weapon enchants in legion.
The prestige system kinda flopped because getting honor in arena is just to inefficient. So most players that want the achievements / rewards just do WQ.
And even if you get 2k you have to wait until season 2 ends to be able to get full elite tier because after playing more than 800 matches in season 1 i still miss my pvp normal chest piece, and half of the elite set