Ray Dillinger writes:
Oleg Kiselyov has published some very interesting papers about call/cc that outline reasons why it is intractable as an abstraction and call its utility into question. WG1's charter more-or-less forbade responding to that in any way.
Andy Wingo writes:
There are also a number of minor points about the WG1 draft that I feel were not dealt with in a satisfactory way. A few things come to mind: [...] the inability of WG1 to deal with the suggestion of removing call/cc in favor of delimited continuations [...].
Moritz Heidkamp also regretted the absence of delimited conditions, though he did not suggest that call/cc be removed.