In combination with another strategy, relax the restrictions on Non Maintainer Uploads (NMUs.)
With the current restrictions, there are cases where an NMU should happen but the fear of the maintainer's wrath prevents it.
NMU are already encouraged when they are about translation fixes. Maybe there could be other acceptable reasons as well?
More co-maintenance of packages could improve the situation as well, as it would then be more probable that one of the developers was available when a problem showed up.
See ReleaseProposals for alternatives.
See also LowThresholdNmu.