There is definitely a finite number of points at each resort. You can compute this pretty closely by multiplying the number of points needed for each type of villa at a resort for a year by the number of that type of villa at the resort and then adding all of those numbers together. There will of course be some minor variation each year caused by the number of weekend nights and by things like the extra day in a leap year - but that variation will be a relatively small number on a percentage basis. The total will be different at each resort since the number of villas is different at each resort.
As already explained above, we have just seen a reallocation of the points - where point needs for some nights were raised and that was balanced by lowering the point needs for other nights. As long as the total number of points remains in balance
DVC can reallocate the point charts whenever they determine the utilization by members is out of balance. In reality, this has happened twice - once for OKW in 1996 and again in 2010 for all DVC resorts except CGV.
When DVC Members use their points for the non-DVC options, those points are used to hold villas at DVC resorts for cash rental directly thru Disney (this is done to "pay" for the non-DVC options).
The 2010 point charts do not reflect an increase of 5 - 10%. When viewed as a whole, there was no change at all (except for the minor variation due to annual fluctuations already mentioned).