Narayam is currently available on ml,ta,si wiktionaries which includes Marathi layouts. Enabling Narayam across wiktionaries will need some consensus, although I agree that Narayam is useful in wiktionaries where usually more than 1 language is present in content.

Universal language selector will fix this, but meanwhile

should we enable Narayam across *all* wikis(all wiktionaries is asked for by Mahitgar) in cluster with $wgNarayamPreferenceDefaultValue = false option?, so Narayam is available in every wmf wiki for any user who wants it, for others it would just add an extra preference option.

$wgNarayamPreferenceDefaultValue can be set to true for the current list of wikis which have asked for Narayam to be deployed so anonymous users of these wikis will remain unaffected.

*Narayam is needed in Wikispecies being a multilingual project again

*Wikibooks & Wikiversity projects will benefit from Narayam, since language learning artcles are written and used

*Wikisource,Wikiquote,Wikinews unless those wikis are multi-script I dont see any benefit but no loss either

*About Wikipedia I beg to differ a bit as below
::In Wikipedia generally different scripts are needed only at two places one is inter-wiki linking and secondly in articles in introductory sentences to tkae note how a particular name (usually person and place names) is written in his/her/their native language.

::In interwiki linking Narayam is of no significance use since usually I am supposed to copy article name verbatim and go on pasting across wikis.

::Yes it is usefull for introductory sentences to tkae note how a particular name (usually person and place names) is written in his/her/their native language.But here also presently people usually copy paste it from English language wikipedia and that is better system; since english wikipedia gets high number of views, what is being written gets checked for accuracy.
*So I support adding Narayam for all scripts in Engilsh language wikipedia
::In other language wikipedian chance of visits from across all language to all articles is limited.For local communities it is defficult to ascertain and confirm accuracy of what is being written.While i hae faith in good faith still
*I am not sure to include all wikipedias but being selective would be better policy.

Thanks and regards

This will be fixed as part of ULS.
http://mediawiki.org/wiki/Universal_Language_Selector

[Removing RESOLVED LATER as discussed in http://lists.wikimedia.org/pipermail/wikitech-l/2012-November/064240.html . Reopening and setting priority to "Lowest". For future reference, please use either RESOLVED WONTFIX (for issues that will not be fixed), or simply set lowest priority. Thanks a lot!]

This will be done some day when the UniversalLanguageSelector is deployed everywhere.