My question is, is there any plan also to demote those accounts that ranked up years ago who does not earn a single merit even though they are here for a long time? I have observed that even though they ranked high but they are not contributing to the forum and even spamming here. I know they were here ahead of me but the purpose of the merit system does not affect them.
It depends on what happens in the future. If the "garbage-posting" continues, more restrictions will be imposed.
In general, the purpose of these restrictions is to increase the quality of posts. Once this achieved, rank-up will return to activity.
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I'll think about tying some of those to activity instead of rank in the future.