Absolutely.
If there were some kind of cap to tuition, or at least when the student starts their program, perhaps capping it for the length of their program.... In the time since I've started my Ph.D., my tuition has risen constantly, year after year. I wouldn't have expected it to rise as much as it has when I started, so even just locking it in to that value for the length of a program would go a long way.
Unfortunately in Canada—I'm speaking from a biology perspective, visiting biological stations and being involved in long-term research myself—many students who are volunteering in the summers to get that experience are still paying these increasing tuition costs. There just isn't the flexibility in some of those grants to even be able to pay the volunteers. People are stretching themselves thin or going completely broke to get the experience to be competitive. They're really paying that cost in terms of their financial stability and what options they have by the end of their program.