Revealing information makes this a rules change (not just usability one), and just "nice to have" one -> not targeting already established S3_1.
This idea may go if the obsoletion written in the report is calculated to the player who reads it, not who owns the wonder. Effectively, a wonder may be obsolete for one player and not so for another (that means, each player will get a separate traveller's report). But there can still be (if I don't mistake) an info leak if the obsoletion is based on world's tech knowledge when the player does not know all of it.
For a long time, i was wondering, wouldnt it be nice to have the travelers report for wonders to report if a wonder is obsolete?
one could argue, that that would reveal information about developed tech, but the report itself is already revealing much information and so we should anticipate more information here, like we already do with destroyed wonders.
PoC patch will be attached.