If the CV update was intended to improve the popularity of CVs in the game, it surely has. I think that Wargaming wants to make this class a regular contribution toward every match, but this seems to alternate wildly through the day and through tiers.
Maybe it's time for tier 5 7 9 CVs?
With some long and hard thought, maybe. As a player who only recently took up CVs, I've been trying to get from T4 to T6, but this jump is incredibly long and incredibly boring. T4 CV gameplay basically puts to me to sleep and if anything is going to put me off playing CVs at higher tiers, it's having to play 50 - 100 games on a T4 CV, because this slow, boring gameplay will leave me with a bad impression of what higher tier CV gameplay would be like. I'd have already stopped long ago if I didn't start off with a T8 impression thanks to getting Enterprise out of RNG boxes. Otherwise, I can sincerely say that this grind is way too damn long and way too boring. First impressions are key to keep someone interested.
Collectors will love it
Correct if I'm wrong, but I get the idea that World of Warships' player population has a strong selection of collectors who simply want to unlock their favourite ships from history and maybe the game's paper warships too. The more ships in the game, the merrier these players are.
CV popularity should increase
Because players are wasting AA II and Fighter II consumables in games that have no carriers, not to mention AA builds. The fact that losing a resource based on the probability of encountering a CV is a disappointing one. It's also fantastic when players give up on playing AA builds because of this, then the CVs start coming. I don't want my earned resources to be absolutely wasted because of this.
It can balance itself
With the current tiering of carriers, I feel like I have there's a strong probability to either of the following:
1. I'll be too effective.
2. I'll be too ineffective.
Meaning that being balanced somewhere in between is hard to achieve because on one hand, I'll be smashing ships two tiers down and on the other ships that are two tiers up will demolish my aircraft. With more CVs in between these tiers, I believe that it's credible for broader balancing to take effect. In other words, the odds change drastically and thanks to that the 2 probabilities described above become scarcer.
A genuine decline in upper tiers
I rarely ever have a tier match in range of tier 4 without any CVs, not to mention often 2 of them, sometimes even 3. Low tier CV gameplay appears to attract a lot of attention, but because of the vast gap between T4 - 6 I suspect that most players give up somewhere in between the grind. In range of T6 and above I've noticed that the probability of seeing a CV plummets drastically. I could be wrong, but this is based on what I've seen in-game. Wargaming has the statistics.
Destroyers should be crying
Please don't kill me for saying this, but before the rework, skilled destroyers could go to town on a team without being spotted throughout an entire match. They could employ wholly riskless gameplay and be incredibly effective while doing so. Carriers mitigate this and push players to rely on their team and reconsider the solo gameplay typical of many destroyer players. It is, after all, a team game. They can no longer get away with that and that is balancing in effect. It's simply a case of having to rethink your strategy.
The above, true rivals
It's in this way that I observe Destroyers and Carriers as true rivals on the seas. Because destroyers love sneaking up on carriers and carriers love foiling destroyers. Camping carriers getting out-right deleted by sneaky destroyers does tend to happen and over-extending destroyers do get sent to the bottom of the seas by carriers when caught.