Considering the concerns that the FTMB is struggling, a "dislike" button is likely to kill it dead. It will certainly become a more hostile place. Do we really need that?
No, we don't ... It strikes me that it would help to step back and look at the bigger picture ...
We now have multiple threads (one with a poll) on the subject of expressing one's opinion on one or another poster and / or posting and whether / how FTMB should be handling such expression features.
IMHO all these derive from, and / or point to, a bigger problem ...
Over the last decade, the following trends have been evident on the FTMB with regard to posted content:
(1) A huge increase in personal / 'social' chat as our ever more numerous members come to know each other, and
(2) A parallel shrinkage in the proportion of FTMB threads / posts in which anything even remotely construable as discussion of Fortean topics occurs.
During this same timeframe the following trends have been discernible with respect to posting behavior:
(1) A growing inability or disinclination to stay on topic within any given topically-defined thread,
(2) A burgeoning tendency to slip into extended series of quips (and nothing more ... ) piled on in response to a post, with these quip-fests often serving as pivot points into tangents (cf. item 1),
(3) An increasing number of items posted as new threads, even though there are obviously one or more established threads within which they reasonably belong (alternative phrasing: an increasing avoidance of searching before posting), and
(4) The growing prevalence of cursory 'drive-by' postings (most particularly links to external content) without any contextualization or comment.
In summary, the FTMB has been inexorably mutating in the direction of trite 'social media' interplay and away from the sort of discussions that initially attracted me (and, I'd venture to claim, other longstanding members).
We're now at the point where we're caught up in debating features and capabilities dedicated to such 'social' aspects of board participation.
The latter-day tail is now starting to wag the original dog. This, I believe, is a danger sign.
As to the 'ignore' issue itself ... Given the overall (board-wide) trends cited above, it might be more helpful to provide 'ignore' (or equivalent) options at the level of entire sub-forums / sections (e.g. Politics) rather than individual members.