Look for tech that in 20-30yrs will be collectable that is common now.
Quality bluetooth keyboards.
Think of all the touchscreen devices coming out now that have limited input connectors. 20-30yrs from now, collectors will want physical keyboards for them. So better BT keyboards will become desirable.
Touchscreen AIO PCs running Windows 8
Everyone skipped over Win8 so fast for a big product and then MS buried it with free Win10 upgrades. These computers will represent the "ideal" Win8 experience even though it's not what people really wanted.
SLC SATA SSDs
These will probably be the only SATA SSDs left working in 20-30yrs. SATA is also starting to drop out of favor for SSDs and the market for the high end drives is using different interfaces. More compatible SATA drives will be easier to use.
SATA Blu-ray drives. They weren't really used for anything on PC, there's no software, few movie programs with heavy DRM, and are a relatively poor choice for data backup
They'll be niche collectable at most
The tiny batteries will all be dead and wireless standards will change making them difficult to use. They are in a race to the bottom right now for price and won't be seen as a quality option in the future compared to reliable wired headphones.