it's a terrible idea and i should not have to explain why.
titles in wc3 are ancient and over half the titles are for players who stopped playing circa 2009. how do you then define which of the titles belong to "active" players and which don't? starting 2014, wc3 warlock has degraded in activity as well so there is hardly anyone who can be considered "active".
there is also no way to confirm the identity of a title owner in a way that is reasonable. it would be a makeshift way of simply asking people on the forums "hey what's your corresponding steam/whatever" with no guarantee other than the trustworthiness of the player/his presence in the community in the past few years.
third and most important of all titles are fucking retarded and shouldn't be in the standalone period lmfao. the only reason to shoehorn titles in would be some sorta a blast from the past, which would at best be acceptable for the developers. when you are making a standalone in a global network like steam (or whatever else) then having the user pick out a title is not a feasible award. for one, it is not a good idea to give a player the option to input his own text in official-looking badges (someone can have his title be "Administrator" or just something offensive), and it is not feasible to have these titles administered by hand by the developers, because that is retarded. in a standalone game, these sorts of rewards are automated (see steam market), barring that they are part of prestigious and rare events like big tournaments with big money involved, and if titles are awards for that then hell no, the old players should not receive them, which would be an insult to the new winners (an understatement). the only option left is to include titles as a unique award, and like i said, that is the only valid option, but stupid nonetheless- something only for nostalgic value (unprofessional) and again, at best would only be for the developers.
it's also worth mentioning that titles are intrinsically a terrible award system that barely works in wc3 (it is very inconsistent what merits a title and what doesn't, tons of legacy titles). it's only used in wc3 because there wasn't much that could be done there.
a correct way to shout out the old community is via easter eggy/creditsy text of their usernames. not give them outdated, obsolete and now-undeserving awards for doing absolutely jack shit for years. hello i won a tournament two billion years ago please give me my title in a completely unrelated game. 080-090 versions are not what warlock is today.