Are there anyone who's opposed to the forever expansion?

Depends on which sort of expansion you mean. There are two models as far as i'm aware, the model of constant expansion (an ever increasing universe), or the model of expansion up until a point where the gravitational pull of the universe = expansion rate i.e. static universe. Then there's the big bang/big crunch, where the universe implodes on itself after a period of prolonged expansion.

i guess only time will tell... got a few million years???? I'll put the kettle on!!!!

Well the most likely scenario, cosmologists say, from current gathered evidence is the universe's expansion rate is increasing and will expand forever...

Plat,

Current evidence suggests we will expand forever. Unless the researchers find a lot of mass hiding in unexpected places, this will be the favored bet.

Don't worry much about it. In many respects the universe has already suffered it's heat death. We baryonic life forms are just taking advantage of a cool period near the end. Maybe there are other symmetries to break and slower lifeforms possible that will take over in a trillion years.

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-al

I dont think its settled yet, I mean we dont even know dark energy and dark matter, we dont even know if they exist or not we only know of some of the effect it has on space....how can we let these dark mysteries predict the fate of the universe

No, its not settled, however, at the moment, there is a great deal of evidence that pretty strongly says we are expanding forever. Yes unknown dark energy is part of the picture, but I wouldn't bet against Dark Energy existing.

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Forming opinions as we speak

I wouldnt say great deal...its all assumptions and guesstimates

even Michael Turner (one of the worlds best cosmologist) says its wide open