Agree OP. I think it's a stupid and pointless exercise and a total waste of time for a heterosexual couple to have a civil partnership ... 'oooh the gay people had them so weeee want one! Because it's discrimination against heteros to not allow it!' 
FFS 'civil partnerships' were made specifically for gay people to have the same rights as a married couple, because gay marriage was illegal!
As soon as gay marriage was legalised, civil partnerships should have been obsolete. It was nothing to do with heteros, nor should it ever have BEEN anything to do with them, because it was created for gay people.
This has opened up a right fucking can of worms now! The right-on 'marriage is only a piece of paper,' and 'I am not being owned by a man,' and 'I am not being a Mrs' brigade will all want one now.
People have some bizarre ideas of what marriage is these days! As has been said, marriage is NOT the 'man owns the woman' bollocks it used to be, it's not misogynistic, women don't have to say they will 'obey' men anymore, the woman doesn't have to 'dress in white,' they don't have to be 'given away,' and you can make it what you want, including 'writing your own script' for it. So why couples don't want to get married, and want a 'civil partnership' just baffles me frankly...
Hopefully it never takes off, and is not brought into law, because a civil partnership for heteros is pointless bollocks.
I also have no idea why some people have a problem being called a wife, or them and their man being 'husband and wife.' WTF is wrong with it?! 
And if you have kids, whose surname will they have??? Hmmmm? The man's obviously, as they always do! 
I did laugh at the suggestion that people who think civil partnerships for heteros are dumb and pointless, are jealous. Of what exactly ??? PMSL!!!
Also agree that a man who doesn't want to get married, is not going to enter into a civil partnership either! He doesn't want tying to a certain woman via marriage, why the hell would he do it via a civil partnership, that will ultimately give her much of the same rights as she would get if she was his wife?!!!
And no-one is 'threatened' by it either. Again... WHY? What is threatening about other couples having civil partnerships???
Nothing, that's what! Like there is nothing to be 'jealous' of. Trust me, a married woman is NOT going to jealous of a woman in a civil partnership - I can promise you that. And you're deluded if you think they will be.
As a pp said earlier, a civil partnership smacks off 'yeah I care about you and have feelings for you, but not enough to marry you...'
Finally, why do people keep coming out with 'you don't have to have all the hoo-har and fuss and expense of a wedding' line?! You don't HAVE to! You can book a slot in the register office for less than £50, buy an outfit from New Look for £30, get 2 witnesses, and be in and out within half an hour! So that doesn't wash!!!
Someone asked 'If it doesn't affect you why are you bothered?'
I just roll my eyes when someone asks that!!! 🙄
It's called 'having an opinion,' and people are entitled to comment and give their views. What's more, the couple went public with their '4 year long battle!,' and this is called a discussion board. People are going to discuss it. Deal with it.