We purchased our X 100D in June, with white interior and all of the features selected (including EAP/FSD) - list price was $117.5K. Taking out the FSD (since that's not currently offered), the non-FSD list price was $114.5K.
The same configuration is now $107K - a reduction by $7.5K. Since we'll get the full $7.5K tax credit and current vehicles would only get $3750, that reduces the price decrease to $3750.
If they've reduced the onboard charger from 72A we have in our X 100D, to 48A today, that option used to cost $1.5K - which reduces the cost reduction to $2250.
Another difference - we were able to get FUSC (Free Unlimited Supercharging) with our X 100D last year - which is no longer offered. Assuming an 8 year lifetime for the vehicle, that's likely an additional $1000 of value - which effectively reduces the price decrease to only $1250.
When we ordered our S 100D in 2017 and our X 100D in 2018, I didn't believe Tesla could continue increasing the prices of the S & X. After ordering our first S P85 in late 2012, Tesla was able to hold the fully configured (non high-performance) price to around $105K - and when they introduced AP, the prices started inching upward - and now they're back to around $105K for a fully configured (non high-performance) model.
While this price decrease may have a small impact on depreciation, it's not that significant for a vehicle in this price range, and wouldn't be surprised to see Tesla try to push prices even lower as other manufacturers get into the market.
Or what we're likely to see is Tesla maintain this price point, and continue to add new functionality - such as increased range with the 2170 batteries, including EAP as standard, and possibly introducing some form of FLSC (Free Limited Supercharging).
However... If we were ordering a new X today, we might seriously consider purchasing the standard range version with the software-limited battery pack. We almost always charge to 90% and only charge above 90% during overnight charging when we're getting to leave home on a road trip. Since the standard range should be able to charge to 100% of the available charge without any risk of damaging the battery, not clear the extra $8000 is worthwhile if it's only used for a few times each year, and save a few minutes at the first supercharger stop...
For experienced Tesla owners, it's possible they will opt for the standard range - and that does result in a significant price drop for the S & X...