I hate to say this but I can see where the BBC are coming from with this. I certainly do not want to watch a sexed up version of my favourite show, but the BBC are only concerned with ratings. If a sexed up version brings higher ratings than the show at present, that's what we're going to get.
If you look at our current pro line-up, ruling out the ones who are either taken or gay (I'm assuming the BBC wouldn't necessarily be keen on a gay relationship to sex the show up), as far as I know that leaves Anton, Brian and Kristina. So chances of much chemistry going on are minimal. If they had a cast full of single pros, the chances are much higher, and as a result there is more potential for headlines and pulling in new viewers.
I'm not saying this to ruffle feathers, but if you look at the most popular couple on DS, undoubtedly Matt and Flavia... and then wonder why, after all this time, they still have threads full of conversations about them when they competed over a year ago... it's not hard to draw the conclusion that it's about their relationship, both during and after the series. I'd hazard a guess that it drew viewers in, both for SCD5 and the following year, it made people more interested in Flavia, it interested people when Matt DA was in the audience. So I wouldn't be surprised if the BBC were interested in recreating that kind of storyline. Which would probably require a new set of pros, since the current ones are mostly taken and, as far as I can see, less likely to stray.
If you then add in the people who would like a drastic change to the pro line-up anyway, which seems to include a fair proportion of the dancers who watch the show, I wonder how many people seriously care if the current pros are retained?
I think I hold a minority view when I say that the pros make the show for me. I watch my three favourites religiously, and probably wouldn't watch if they were dropped. And my favourite part of the show is the pro dances. So I sincerely hope the story isn't true, but I wouldn't be surprised if it is.
ETA Forgot to add another dimension to the appeal of relationships on the show, which is that a lot of people, me included, quite like the thought that some of the pros are married to each other. I know that after series two to four, when Darren and Lilia had featured very heavily in three consecutive series, there was an awful lot of interest in them as a unit (on forums I mean, not in the press). I wouldn't like to see them doing tabloid interviews or anything, but the fact that my two favourite pros are a couple sort of increases my affection for them! Which is what I was getting at with Matt and Flavia- they would have been popular anyway, but the fact that they fell in love increases their popularity beyond what I suspect it would have been if they had been two separate people who happened to dance well together. The whole is greater than the sum of the parts, as they say.