Two words: GIFT. SHOP.
If they can show that (despite the last two films being disappointments) the Indiana Jones IP is still popular enough to sell more fedoras, jackets and rubber snakes than anything sold at Chester & Hesters, it’s worth the change over.
It’s possible that they just wanted to see if dial of destiny really caused merchandise sales to dip at the DL Indiana Jones outpost. I suspect that it’s been long enough to demonstrate that the merchandise at that gift shop is moving as steadily as it ever has, and so adding the attraction to AK will be seen as a wise investment.