They should have introduced the xp scaling when they released this system, eventually the cap will be removed, due to reaching 3k+ and hopefully most low cp people will have caught up somewhat to the top grinders.
Honestly, I think they plan to increase the cap at such a low rate that it won't be a problem. To have a cap of 3600 wouldn't happen for five+ years, far longer than ESO will probably last. So if they released four DLCs per year and increased the cap 50 pts per DLC, that would mean in five years the cap would only be 1501. Sure to someone new coming in that would be daunting, but also by then I expect that they would have tweaked their CP gain to allow players and even faster means of catching up. In other words, each time CP cap is increased, the catch-up mechanism of gaining XP will also increase.