Yeah, that certainly remains the only actual detractor from the idea. If they put all this work into PvE and it turns out to be good, then we might very well hinder the core PvP gameplay.
This is very much why I am an advocate for a community initiative to find an acceptable compromise that continues to prove innovation. I've said it elsewhere as have many others, the 2 I think of more personally is:
1. Secondary Market: Indiscriminate, Measurable, and gives the ability for players to make choices with their feet/money on what is actually OP or underpowered, etc. ---> Gives immediate VALUE to ISK, Rewards, and Loot!
2. Boarding Parties: The ability for Eve Players to use Dust Mercenaries as "living ammunition" to board their enemies ships and destroy/capture them would give an extraordinary boost to pretty much everything PvP and essentially create the meta-game. Throw in Stations, POS's, and POCO's and you got yourself an extremely high-demand resource in Dust-Bunnies. Probably almost too much...which would be great for our revenues
The PvE would have to be something rather challenging in my opinion though. (For the Boarding Mechanics). You would be limited to the number of "pods" Eve Players could launch into the ship (let's say ie: 1 pod/ per pod bay "turret slot" and it fires an average of 1 per minute, etc) For every pod, we get something close to 6-12 Mercs (I'd even be cooler with less) with very limited supplies. From there it's an uphill battle with a high demand for more supplies and clones, but absolutely no guarantee and the inherit possibility of defending mercs being spawned aboard (if the defending ship thought ahead to carrying clones or a clone barracks).
This creates a PvE mission with the every present threat of rapidly escalating to PvP. (details in earlier pages)
I think these alone would launch enough gripping material to allow players to create their own depth of the game as well as a provide a great window of opportunity for CCP to take some time getting SOV/0.0 warfare done correctly. Essentially, Dust Bunnies will prove themselves as vital assets to whoever is smart enough to use them early and create their own measurable demand which would only increase after the full gambit is released