There are a few drawbacks to converting 1/2 of Yacht Club to DVC.
At least pre-COVID, Yacht and Beach Club's convention center was a profit center for Disney ($$$$$), but most attendees stay at YC ($$$).
YC is large resort with something like 650 rooms. Around 10% of those are dedicated to concierge, making it one of the largest on property. They're also very popular with conference attendees ($$$).
YC also has some odd room configurations including pet-friendly (dog) rooms ($$$) and something like 20+ suite options ($$$).
There's a lot more to consider, but ultimately it'll come down to reducing risk and timing.