Fun facts: Disney actually ships pretty much equally to Long Beach, CA and Jacksonville, FL already. Most likely to balance shipping costs across the country.
Numbers are from early 2015 to Dec 2021.
Long Beach = 3,812 Shipments
Jacksonville = 3,387 Shipments
The third-biggest port they use is Savannah, GA (711 shipments).
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So I'll say it again, these issues aren't likely to affect Disney
much.
The effects are most likely already known though, and have been observed. WDW has been releasing merch a few weeks earlier than DLR lately.
If they were actually being hurt by it, they could go the WDI route and just throw money at the problem and overbid for shipping (or go air).
This merch shortage (imo) is from probably burning a lot of suppliers in 2020 and bad sales forecasting.
As an example, this is their current top supplier by shipment number.
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Number of shipments in from them to Disney in 2021: 20
Number of shipments in from them to Disney in 2020: 214
Number of shipments in from them to Disney in 2019: 701