Eh, I think they're probably more relevant today than ever. EVs still don't have enough range for road trips, and hybrids offer the same range as gas with significant fuel savings.
That said, I think plug-in hybrids have pretty limited usefulness and should probably be phased out (and IMO should never have happened). You're not going to plug your car in during a road trip, so the main benefit is local trips, which is better served by an EV anyway. If your household has two cars, you should probably have an EV and a hybrid.