Sort of. Getting caught up late in BC is much easier than, say, 1.13, thanks in large part to how easy it is to assemble a kit of Season gear for honor starting with Season 2 onwards. While Resilience eats up a lot of the stat budget, you can reliably use Season 1 gear onward to skip Heroic gearing and focus on attunements for Karazhan, and depending on your spec (most notably Bear druids), Season gear has strong performers in some slots on equal footing with their analogous tier set. So from Phase 2 on, catchup is probably going to be very easy from at least a gear perspective since you can just get HK-farmed in battlegrounds until you have what you need to get over that initial hump.
Catchups in BC are more problematic from an attunement front, especially if guilds recreate the rampant poaching that went on in BC, as people are going to get sick fast of running the same dungeons to attune new recruits over and over.