If a studio is 168 points in the highest season, can that ever go up? Am thinking of adding on so I always have the required points for an 11 month mark Christmas stay if I want one. Should I get more than a total of 168 just in case?
I think it's unlikely premier season points will go up so you likely don't need a cushion in this situation unless possibly one is targeting S-F and I think that is a minimal risk. The real risk is you change and decide you want a larger villa.If a studio is 168 points in the highest season, can that ever go up? Am thinking of adding on so I always have the required points for an 11 month mark Christmas stay if I want one. Should I get more than a total of 168 just in case?
Not only can DVD change the allocation from season to season, but a few years ago DVD changed the points needed for F-S and S-T. This was done because of the large disparity between points needed for a Fri/Sat stay and a Sun-THurs stay. THey were seeing people(like me) booking Sun-Thurs trips and skipping the high point nights of Fri and Sat.
Now the disparity is far less and more in line with what it should be.
If your vacation changes every year, you can use banking/borrowing and the ability to "rent" a few points from Disney (only at the seven month window) to get the vacation you want without necessarily having a cushion. If you find yourself in a perpetual hole by borrowing, then add points. Or, do a cash stay the year you have few points, or take a non-Disney vacation, or rent points from another member that year.
But unfortunately those can't be used until the 11 month mark and I'd only need the extra points for times like Christmas that has to be booked at 11 mos to get.
In your OP, you implied this wouldn't be your regular trip - this would be a sometimes trip. When this is your sometimes trip, plan to have enough points at eleven months to make it. Rent points from Disney at seven months when your trip is a low demand sort of trip to balance it out.
We managed to get two two bedrooms on our 150 point contract by planning. It used up almost three years worth of points, but since we knew we'd be doing it, we made sure we'd have points from both the previous and the following year available.
Oh. Wow. That takes a lot of planning. I hadn't considered buying points to save current points. Great idea. Thanks!
Having extra points that "need" to be used can mean suddenly $800 in airfare disappearing from your budget for a Food and Wine weekend 
Such is the nature of timeshares. Either you learn and use the system and win or others win at your expense.Oh. Wow. That takes a lot of planning. I hadn't considered buying points to save current points. Great idea. Thanks!