Personally the first part does have some merit. Some have left for other areas, be it the board or personal with barely any word.So how about setting some participation guidelines for the senate. Don't participate in the discussions or votes, then slap them with a Senator Emeritus title and make room for a new senator that will actually participate.
Instead of the Senate choosing new candidates and voting on them, how about once every one or two months open a public thread in OT and let the general membership toss out some candidates and let the Senate narrow the list from there before voting. That way the "plebes" have a say in who gets to be part of the board leadership and the Senate still has final say on who their members will be.
As for the second, that can be debated amongst you, but it does foster the thought that the Senate is leading or trying to being a body of the people rather then incestual voting amongst itself.