These debates are hard to watch. 'Loss of sovereignty' for some reason is perfectly fine for Iceland, Switzerland and Norway, but not UK or others wanting to leave.
'Fisheries' was a small but founding and perennial concern before and during Brexit but they were labelled 'ugly nationalists'.
The EU has benefits obviously but it's been failing Europe in critical ways for about 20 yeas now, and the crazy paradox is that the nationalist threat of Germany's withdrawal from the Euro itself - for really stupid 'stated' reasons, might actually be beneficial for very smart 'actual' reasons, as the strong currency favours Germany over everyone else.
The EU is in bad need of reform, much like FIFA or IOC or the hopelessly broken 2 party system in the US, it likely never will. Very ugly nationalists may come and tear it apart.
Nominally, I hope Iceland joins but it's not going to help anything very much.