From the article; " ... without really ending the schism means incurring yet more guilt."

I'm not aware of any remaining guilt, much less " ... yet more guilt." -- at least not among the people in the Catholic and Protestant pews. 

I suspect the clerics have their own agenda, though. I also suspect an insistence of the Primacy of the Papacy will stop unification in its tracks.

I'm familiar with the basics of the schism, but not all the minutia. I suspect both sides were right on some things and both sides were wrong on some. But after 500 years it seems reasonable to issue mutual apologies and move on. 

I consider commitments to the two great commandments on the spiritual side, and to the golden rule on the secular side, as being enough to have in common.  EVERYTHING else is details that can be left to individual denominations and accepted by all other denominations as non-schismatic.