DD(17) has been begging DS(16) for the last 11 years to swap rooms, when we did the loft conversion 14 years ago she chose the smaller room, while DS took the bigger room. She's wanted that room for ages, and it only got worse as she's come into taking her A-Levels and needs more room. If they had decided this even 6 months ago, I think I would be more willing, but DD is off to uni in late September, as is hoping to have completely moved out within around 4 or 5 years. Obviously, things don't always go to plan and we will be saving a bedroom for her, but I don't think her spending money and time on decorating (she wants to buy all the paint herself, which we won't allow, but also wants to buy some furniture etc. as she has barely anything from being in the small room). DH and I think this is all very random, and a) DD will regret spending the money, and DS will realise that he doesn't want to downsize (the rooms do vary quite a lot in size due to the way the conversion was designed, we gave DS and DD the choice but DD chose the small room). DD and DS want to get going as soon as possible (DD is revising for her A-Levels and wants to get her posters etc. up ASAP), but we are unsure as to whether we should allow it or not, any opinions?
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TheOther her room at uni will purely feel bigger due to the lack of sloping ceilings, the ceilings are what makes the room feel so small, and what will make her uni room feel big for the first week 
I don't understand why you've stressed twice that she consciously made the decision to have the smaller room as if she is now being ridiculous and contrary to go back on it - from the timescales you've given she made that decision when she was three! and has regretted it and wanted to change since she was 6!!!!
So YABU to hold a decision over her head that she made when she was a toddler with no understanding of what her needs and wants might be in the future.
YA also BU not to have encouraged DS to swap with her years ago if it has really meant that much to her and he isn't bothered about having the bigger room.
Also a bit 
that DS has threatened her that if she doesn't swap he will 'take her room when she goes anyway.' Um - no - you are the parents and it is your house. If you're strict enough to say your DD has to live with a mistake she made aged 3 then you're strict enough to say that your DS doesn't jump into his sister's room without her consent the second she leaves for uni.
Ultimately - both of them are up for it, she's happy to pay for and do the painting so your expense and effort will be minimal - go for it.
Surely he might also be going to uni shortly anyway so one year in the smaller room isn't a huge deal in the scheme of things?
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I'd completely leave them to it, I'm struggling to find an issue at all
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