Yes and no. The total points at a resort can never change. And by total, I mean the number you get if you added up how many points it would cost to book the entire resort (ALL VILLAS) for an entire calendar year.
Disney cannot arbitrarily implement across-the-board increases. They cannot simply decide that one night in a Studio should go up from 20 points to 21 points.
What they can do is "reallocate" the points such that for every increase there is an offsetting decrease. They have done this several times in recent years. Used to be that Friday and Saturday nights cost about 2 - 2.5 times as many points as a weekday night. Problem was that too many people were using points for weekdays, leaving high vacancies on the weekends.
DVC responded by decreasing the weekend costs and offsetting this by an increase on most weekday nights.
Other noteworthy tweaks have involved some adjustments for Standard View rooms at Animal Kingdom Villas, Standard View at Bay Lake Tower and the Treehouse Villas at Saratoga Springs.
But again, for each area in which there was an increase, something decreased. The main question is whether you would personally win or lose in any future reallocations. That's a total unknown.
As I said, four years ago there were a disproportionately high number of people using points for Sunday - Thursday weekday stays. Those people were not pleased when DVC raised the weekday costs and lowered weekends. But the folks who were using points predominately for weekends suddenly found their trips costing less.
If possible, purchase about 10% more points than you would need for your typical vacation, just so you have some buffer in the event of an increase. Or at least be aware of the possibility and be prepared to deal with it should a future reallocation work against you.