I don't think this is wise. Why bring up the subject if it not an issue? If you do, it might awaken the antis to come out against us. They will usually have the numbers. Bad bad idea. Not very well thought out. Thanks.
Plus, you cannot proactively pass a bylaw to prohibit future bylaws. And even if you could, it could itself be reversed or amended at any future meeting if on the warrant. Bad advice.
Correct.
The time to do this is if your town/city forms a charter commission and re-writes the charter. The Charter as a whole goes to the vote of the whole town, but the details are usually written up by a charter committee/commission. Get yourself ON that damn committee. A town/city charter is like a constitution - much harder to change or override because changes need to go to the polls. For example, Framingham just voted to become a city by voting in a new charter.