Why do you make a topic like this every few weeks?
I'm sure that eventually you'll make one that will only ask for 50%+ in favor of the change and eventually it'll pass.
It shouldn't though, for the sake of the longevity of the scene.
Higher cmbt will lead to more mains on weekends
It will lead a lot of people to make clanning accs (lets be real, if you're solo pking with a 101 with 1 def, you're not going to have as much fun, as doing it on a level 78-88). The numerous CA/sperm pk trips that take place every week will be fucked, since the many members will have around 15-20 combat level differences, bringing the cancer of "Hey who can attack this guy, get on him".
I personally feel there's a lot of new people coming into the scene. If that is to continue, you can't have clans that are mostly 101s as that is both intimidating and broccolied in terms of small pk trips (the reason for joining is often that people want others to pk with).
I don't think raising the combat will necessarily bring def, as you guys have done a good job of getting rid of it. (although a good point was raised earlier that ppl won't want to train, and being lazy, will rather just bring HPC accounts).
What I suggest is that when the fun of LPC has run its course, when people will start deeply missing their mystics, addy sets and prayer capes, just start a movement to move back to HPC. If you can get the big clans to do that, I'm sure most will follow for the sake of action.