I've used ML quite a lot, which of course has records without constructors. But the problem with this is that (1) you get massive error messages; (2) there isn't a mechanism for filling in empty slots. I don't think you really gain anything except the labour of not typing the constructor name.
On the other hand, you would lose the Haskell feature by which when several constructors all have a record of the same name with the same type, you can extract that record in one operation. This is occasionally really useful, see the spaceships paper in this year's Haskell workshop.
I am definitely against anything which breaks code in any major way, as I'm sitting on top of 90,000 lines of Haskell, which uses records a lot. (I like records.)
Perhaps the only things which could be improved would be : (1) when some constructors have a field of type X, and others do not, it would be nice to have a way of getting a Maybe X value out. (2) I wish there were some way of allowing constructors for different types to share a record name. But perhaps the overloading required would make this not worthwhile.
However neither (1) nor (2) is a priority for me.
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