RE: The opposite usually happens. Orthodoxy does evolve, but it is a very long process. In fact, the various ecumenical councils success depends on the level of acceptance by the faithful over time.
I’m not sure what you mean by “evolve”. If by that, one means that certain views and ideas will have to be rethought to accommodate views one encounters in the modern world ( e.g. genetics, political ideas, etc.), then yes, Christians ( not only Orthodox Christians ) will have to consider their theology to deal with these views.
However, there has to be an UNCHANGING ANCHOR by which one bases their thinking on. This ULTIMATE anchor must be relied on to deal with the present.
The question is this — what is that ULTIMATE ANCHOR? Scripture? Or Scripture plus Tradition?
The unchanging anchor is God/Christ.