I think you can still leve link party.

Even though they are reducing the amount you get for leve-linking, it still is only a reduction, there is still some bonus sp there, plus the addition of the SP for completion.

The bonus for SP completion will depend on how hard the leve is plus the time you took to complete, so prolly having a light party for links would help boost the SP bonus, making leve linking viable still?

I'm just speculating though, can't wait to actually see how this will play out though.