I agree that Trump's unpredictability has led many countries to reconsider their defense relationships with the U.S., but the F-35 remains unmatched in terms of capability.
The Gripen is a 4th-generation+ fighter—impressive and affordable—but lacks the stealth, sensor fusion, and multirole capabilities that make the F-35 a 5th-generation jet.
While the Gripen may serve as a solid stopgap for some nations, it cannot replace the F-35's advanced technology, interoperability with NATO, or its future-proofing capabilities.
The next-gen fighters that could rival the F-35 are still 10–20 years away. Tempest (UK) and FCAS (France, Germany, Spain) are aiming for their first operational aircraft by 2040.
The F-35 was first introduced in 2015, with full operational capability (FOC) reached by 2018, and it has been in service for several years. Its development took about 18 years from first prototype flight in 2000 to operational status.
Given the advanced technologies these new programs are targeting—such as AI, autonomous systems, and next-gen stealth—it’s reasonable to expect that their development will take 10–20 years, similar to the F-35’s timeline.
Sadly, despite any political shifts, the F-35 will continue to dominate as the 5th-generation fighter for decades, well before any viable alternatives are fully operational.
By the way you use the term 'we' may I ask what country are you talking about?
NB: Just to clarify, the UK has not dropped the F-35 for the Gripen. While countries like Brazil, Thailand, and the Czech Republic have chosen the Gripen, the UK has already purchased the F-35 and remains fully committed to it as a core part of its defense strategy. Additionally, if the UK were to reconsider, it would likely continue relying on its locally built Eurofighter Typhoon alongside the F-35, rather than opting for the Gripen.