All it's doing is putting in an arms race/escalation.
I disagree - because if they can already Falcon then they can already Rook. As with the Force Recons, if the enemy/target has direct eyes on a jump-in/undock (i.e.: seeing the Force Recon before/after it cloaks/decloaks), they'll see the Combat Recon and choose whether to engage or not. This allows combat recons to be hidden from everything except direct eyes*. There's no further escalation - unlike with, say, T3, which became a race to train the skills and amass the ISK to afford the opening prices of the hulls/subsystems - because everyone can already fly them.
*Except probes, obviously - which, presumably, nobody is going to drop probes to look for random Curses and Rooks that may or may not be there.
I can't see the Combat Recon - any of the four - being well-tanked enough or having enough DPS, let alone both, to run w-space sites (or any other high-value pve sites) either solo or in small groups. Certainly not without Logistics cruisers, which negate the d-scan immunity by their very presence. To see two or three Guardians on dscan at a site, with no other ships in evidence, would basically announce the presence of a Combat Recon fleet, I think.
Further, the Force Recons will remain the preferred ship for tackling PvE players in sites because you cannot know where you're going to land in relation to the target(s). You might warp to a site at 100km and find yourself right on top of them, or you might warp to 100km and find the target 300km away from you. In either case, this is not a desirable situation to be in for an expensive cruiser with a mediocre tank
(at best). The covops cloak of the Force Recon (and the Stratios and Astero hulls) affords the hunter/tackler the ability to examine the situation, possibly bookmark an object/wreck for a better warp-in and initiate contact under more favorable circumstances, while the uncloaked Combat Recon landing blindly instantly alerts the target to the threat, more often than not allowing them plenty of time to align and warp.