Why hovercraft endured while hydrofoils faded

Will hovercraft or hydrofoils regain the popularity they once seemed likely to achieve?

Hovercraft should retain niche roles, while hydrofoils need a technological improvement in speed or carrying capacity to become broadly attractive again.

Hovercraft are expected to retain specialized uses that keep the type worthwhile. Hydrofoils face a less favorable assessment because their speed and carrying capacity do not meet enough modern requirements. Being fast is insufficient if the craft cannot carry the required load. A technological improvement could change that balance, but no specific development is identified.