I don't know about it being a challenge for the home team. It's certainly a challenge for the second place side; but still that's a 20% better chance of winning the shield than they would otherwise have.
I think it's a superficial part of the problem if they are considering cutting the fixture. While there is merit in the concept, Shield finals ultimately did not breed Bradmans or Chappells or Lillees. The final is a very small part of the competition, but it does take up a week. I'd let it go if it meant keeping the 30 game season.
It's bemusing to consider such an astonishing proposal in the midst of a season that has possibly been scheduled by four year olds. There are so many badly organised gaps that you could have the first class season finish in January if you want. Obviously international summers vary, but if they cut back from 10 to 8 ODIs, they could very plausibly have all of February and March next year in which to run the T20s.