Sure is there a chance but just take a look on the folders timestamps https://github.com/nextcloud/nextcloud-filelink. Last release on 29 Sep 2017
It seems like development has nearly stopped. My bugreports and problems that other users have are does not care anyone. Only the “Issues”-tab is active. Maybe the demand for this addon isn’t high enough so that noone will continue developing and invest time into the addon 
With the right marketing and a roadmap (or another kind of plan), users could see that there is a addon in the empty, new Thunderbird-60-store which could be useful and is maintenanced -> raising of demand.
So what’s needed to solve your problem is either raising demand so that nextcloud developers will continue development or a guy who needs the addon and can write XUL/JavaScript.
Now to your Question specific to Thunderbird 60:
Thunderbird is going to rebuild it’s API-systems like in Firefox 60 (Quantum). This means that every addon has to be rewritten on the new WebExtensions model, otherwise it’ll not work. For Firefox the Mozilla Foundation published a manual how to port legacy addons to the new system, maybe they’ll do it again for Thunderbird.
So the solution is to merge the pull request Compatibility with thunderbird-60, fixes #55 #59
I hope that Nextcloud will help with “demand improvement” for filelink (and finally merge this pull request) @jospoortvliet
Edit: After reading another article and taking a look into the mozilla wiki, WebExtensions support will come with TB63, but other Quantum technologies will be implemented in TB60.