More than half of voters surveyed by YouGov doubt the anti-EU party will still be on the political scene by 2025, compared with 35% who thought the same in October last year.
In the latest survey, 53% said they think the party will fade over the next decade, while only 30% think it will endure.
This follows on from a steady decline in people intending to vote Ukip, which peaked at 19% in October but now hovers around 14% or 15% according to YouGov.
This increase in skepticism could be attributed to Nigel Farage's upcoming campaign in South Thanet, which is reportedly forcing the party leader to keep a low profile and avoid any potential gaffes in his bid to take up a seat in the UK Parliament.
The media blackout orchestrated for the usually high-profile leader is the strategy of Ukip's campaign chief Chris Bruni-Lowe, who wants Farage to focus on door-to-door tactics without the camera distracting him.
He will though undoubtedly be gracing our TV screens with his mustard corduroy trousers again soon, as the Ukip Spring conference will be coming to viewers live from Margate on 27 and 28 February.
This latest YouGov poll comes hot on the heels of another, which suggested nearly half of Ukip voters admit to being "racially prejudiced" but deny being racist.
Farage faces pub landlord comedian Al Murray in the battle for South Thanet, along with hotly-tipped Labour and Conservative candidates.