I wouldn't be too sure about it. Sure, they will not be able to repeat the results of the last EU election (where they came out on top) at home in the UK, but t

I wouldn't be too sure about it. Sure, they will not be able to repeat the results of the last EU election (where they came out on top) at home in the UK, but they still might get gain enough seats to become a player and even a "king maker". After all, we live in a time where every poll said Remain will win, and every pollster said Trump had essentially no chance of winning. But you're right, First Past the Post voting can pose a major obstacle for them and probably will pose a major obstacle for them in the next election even if it happens sooner than later. Like in 2015 when they had a popular vote share of 12.6% but got had one seat (or 0.2% of seats)